Re: how do you model in SwitcherCAD?

#924

Jamie,

I want to design and simulate schmeatics involving tubes.  I have 
found several sites online that have available models to download.  
When i click on these models, i see a bunch of commands in a text 
format, what i assume to be spice commands that determine the 
behavior of that model.  so what do i do with this from here?  that 
is, what do i do with this text-like document to associate with a 
symbol so that i can add it to a schematic and simulate it?  any 
help would be appreciated.One of the websites featuring tube models has a page dedicated to
using those models in LTspice.  You might want to check out



--Mike

 


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Re: how do you model in SwitcherCAD?

ramprasad potluri

#923

Hello Jamie,

You can go through the previous postings on LTspice's Yahoo 
group.

Best wishes,

Ram.

Show quoted text

On Monday 07 July 2003 08:42, jamienoonan wrote:
<ja> I want to design and simulate schmeatics involving tubes. 
 I have <ja> found several sites online that have available
 models to download. <ja> When i click on these models, i see a
 bunch of commands in a text <ja> format, what i assume to be
 spice commands that determine the <ja> behavior of that model. 
 so what do i do with this from here?  that <ja> is, what do i
 do with this text-like document to associate with a <ja> symbol
 so that i can add it to a schematic and simulate it?  any <ja>
 help would be appreciated.
<ja> -Jamie
<ja>
<ja>
<ja> ------------------------ Yahoo! Groups Sponsor
 ---------------------~--> <ja> Save on Coral Calcium. Get
 Better Health and
<ja> Stronger Bones. Seen on TV
<ja>
 
 <ja> 
 <ja>
 ---------------------------------------------------------------
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<ja> To unsubscribe from this group, send an email to:
<ja> LTspice-unsubscribe@...
<ja>
<ja>
<ja>
<ja> Your use of Yahoo! Groups is subject to
  <ja>
<ja>
<ja>

-- 


====================================================
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Department of Electrical & Computer Engineering,
University of Kentucky, Lexington, KY - 40506, USA.
Home: 1435 Nicholasville Rd., Apt. 111,
      Lexington, KY - 40503, USA.
Ph (Res): (859) 323-9724
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====================================================

BULD118D spice model

Roberto Poli

#922

开云体育

Where could I find Spice model of bipolar power transistor? ST BULD118D?

?

Thanks in advance

Roberto

?

Negative Resistance

Steve Steckler

#921

Mike and any other interested parties:

?

I've noticed that most SPICE simulators allow the insertion of negative resistors and LTSpice seems to be no exception. However, when you do a Bode plot with an AC Analysis, the Real part of the current is positive and the Imaginary part of the current is zero. I have tried this with other simulators and the Real part of the current is negative and the imaginary part is zero.

?

I'm?attaching a simple circuit with a negative resistor driven by an AC voltage source that demonstrates the problem.

.

Now why I'm really interested in this is that I've done some analyses on oscillators by driving the resonator such as a crystal with a voltage source, and then plot the real and imaginary parts of the current. The condition for oscillation is that the Real part of the current in the AC voltage source should be less than zero when the Imaginary part of the AC current is zero. By sweeping the frequency it is therefore possible to see if the condition for oscillation are satisfied at any frequency.

?

While this method seems to work with LTSpice, the only problem is you cannot be sure that IM(I(V1)), if V1 is the AC source for example, is negative, as the simulator seems to?discard the sign of the real part.

Steve

?

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how do you model in SwitcherCAD?

jamienoonan

#920

I want to design and simulate schmeatics involving tubes.  I have 
found several sites online that have available models to download.  
When i click on these models, i see a bunch of commands in a text 
format, what i assume to be spice commands that determine the 
behavior of that model.  so what do i do with this from here?  that 
is, what do i do with this text-like document to associate with a 
symbol so that i can add it to a schematic and simulate it?  any 
help would be appreciated.
-Jamie

Re: Iteration problems

Steve Steckler

#919

Mike,

?

The schematic comes up without the opamp. I just put an LT1001 in. As you say, the ground is missing. When I wired one in everything worked fine. So, of course, you were correct.

?

Regards,

????????? Steve

Panama Mike wrote:

We can't run the circuit without the file TL071.lib, but one
drafting error that can be seen is that you didn't specifiy
what you meant as ground with the GND(node 0) flag. Press F4,
select GND(global node 0) and connect it to the bottom of Ubat
and Quelle.

Normally LTspice will tell you that there's no ground
connection, but perhaps the opamp model called ground so it
doesn't know about the general circuit error.

--Mike

--- Bernhard_Kraemer@... wrote:
> Hello,
>
> I have a simple OpAmp-circuit to simulate. I would like to get a .AC - Simulation from 1Hz to
> 30Khz, but the simulator starts endless iterations. Depending on the Opamp-Modell I am using,
> the simulation stops immediatly (this was the case for one LT- OpAmp) with the message
> "Iteration limit reached", or it starts these endless iterations and never comes to an end
> (OpAmp TL071).
> Ah! Another problem: For the transient analysis, I get values around 1 MegaVolt (instead of
> MilliVolt)!
> I wonder why the simulation doesn't run correctly, for it is a real simple circuit. I don't know
> what to do now, because I don't have any experience with this kind of problems yet.
>
> It would be great if anyone could help me.
>
> Yours,
>
> Bernhard Krmer
>
> Here is the schematics :
> (The TL071 circuit is attached)
>
> Version 4
> SHEET 1 892 692
> WIRE 352 288 240 288
> WIRE 240 368 240 288
> WIRE 240 288 160 288
> WIRE 240 288 240 208
> WIRE 32 368 32 288
> WIRE 32 288 96 288
> WIRE 416 272 544 272
> WIRE 320 368 320 256
> WIRE 320 256 352 256
> WIRE 320 256 320 192
> WIRE 320 192 432 192
> WIRE 512 192 544 192
> WIRE 544 192 544 272
> WIRE 544 272 576 272
> WIRE 320 464 320 448
> WIRE 640 272 688 272
> WIRE 688 272 688 352
> WIRE -128 368 -128 96
> WIRE -128 96 240 96
> WIRE 384 96 384 240
> WIRE 240 128 240 96
> WIRE 240 96 384 96
> WIRE 384 304 384 544
> WIRE 384 544 320 544
> WIRE -128 544 -128 448
> WIRE 32 448 32 544
> WIRE 32 544 -128 544
> WIRE 240 448 240 544
> WIRE 240 544 32 544
> WIRE 320 544 320 528
> WIRE 320 544 240 544
> WIRE 688 432 688 544
> WIRE 688 544 384 544
> SYMBOL C:\Programme\LTSpice\lib\sym\Opamps\TL071 384 208 R0
> SYMATTR InstName U1
> SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 224 112 R0
> SYMATTR InstName R1
> SYMATTR Value 1Meg
> SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 224 352 R0
> SYMATTR InstName R2
> SYMATTR Value 1Meg
> SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 304 352 R0
> SYMATTR InstName Rvor
> SYMATTR Value 22K
> SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 528 176 R90
> WINDOW 0 5 56 VBottom 0
> WINDOW 3 27 56 VTop 0
> SYMATTR InstName Rgeg
> SYMATTR Value 100K
> SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 704 448 R180
> WINDOW 0 31 76 Left 0
> WINDOW 3 31 40 Left 0
> SYMATTR InstName Lautsprecher
> SYMATTR Value 4
> SYMBOL cap 160 272 R90
> WINDOW 0 0 32 VBottom 0
> WINDOW 3 32 32 VTop 0
> SYMATTR InstName Cein
> SYMATTR Value 100
> SYMBOL cap 304 464 R0
> SYMATTR InstName C2
> SYMATTR Value 47
> SYMBOL cap 640 256 R90
> WINDOW 0 0 32 VBottom 0
> WINDOW 3 32 32 VTop 0
> SYMATTR InstName Caus
> SYMATTR Value 2.2mF
> SYMBOL C:\Programme\LTSpice\lib\sym\voltage 32 352 R0
> WINDOW 123 24 132 Left 0
> WINDOW 39 0 0 Left 0
> SYMATTR InstName Quelle
> SYMATTR Value SINE(0 100m 1K)
> SYMATTR Value2 AC 100m
> SYMBOL C:\Programme\LTSpice\lib\sym\voltage -128 352 R0
> SYMATTR InstName Ubat
> SYMATTR Value 24
> ______________________________________________________________________________
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> ATTACHMENT part 2 application/octet-stream name=TL071.asy

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Re: Iteration problems

Steve Steckler

#918

I didn't see a ground symbol on your schematic. When I added it, and replaced your opamp with one in my library, it seems to run ok.

?

Steve

Bernhard_Kraemer@... wrote:

Hello, I have a simple OpAmp-circuit to simulate. I would like to get a .AC - Simulation from 1Hz to 30Khz, but the simulator starts endless iterations. Depending on the Opamp-Modell I am using, the simulation stops immediatly (this was the case for one LT- OpAmp) with the message "Iteration limit reached", or it starts these endless iterations and never comes to an end (OpAmp TL071). Ah! Another problem: For the transient analysis, I get values around 1 MegaVolt (instead of MilliVolt)! I wonder why the simulation doesn't run correctly, for it is a real simple circuit. I don't know what to do now, because I don't have any experience with this kind of problems yet. It would be great if anyone could help me. Yours, ? Bernhard Krmer Here is the schematics : (The TL071 circuit is attached) Version 4 SHEET 1 892 692 WIRE 352 288 240 288 WIRE 240 368 240 288 WIRE 240 288 160 288 WIRE 240 288 240 208 WIRE 32 368 32 288 WIRE 32 288 96 288 WIRE 416 272 544 272 WIRE 320 368 320 256 WIRE 320 256 352 256 WIRE 320 256 320 192 WIRE 320 192 432 192 WIRE 512 192 544 192 WIRE 544 192 544 272 WIRE 544 272 576 272 WIRE 320 464 320 448 WIRE 640 272 688 272 WIRE 688 272 688 352 WIRE -128 368 -128 96 WIRE -128 96 240 96 WIRE 384 96 384 240 WIRE 240 128 240 96 WIRE 240 96 384 96 WIRE 384 304 384 544 WIRE 384 544 320 544 WIRE -128 544 -128 448 WIRE 32 448 32 544 WIRE 32 544 -128 544 WIRE 240 448 240 544 WIRE 240 544 32 544 WIRE 320 544 320 528 WIRE 320 544 240 544 WIRE 688 432 688 544 WIRE 688 544 384 544 SYMBOL C:\Programme\LTSpice\lib\sym\Opamps\TL071 384 208 R0 SYMATTR InstName U1 SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 224 112 R0 SYMATTR InstName R1 SYMATTR Value 1Meg SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 224 352 R0 SYMATTR InstName R2 SYMATTR Value 1Meg SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 304 352 R0 SYMATTR InstName Rvor SYMATTR Value 22K SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 528 176 R90 WINDOW 0 5 56 VBottom 0 WINDOW 3 27 56 VTop 0 SYMATTR InstName Rgeg SYMATTR Value 100K SYMBOL C:\Programme\LTSpice\lib\sym\Misc\EuropeanResistor 704 448 R180 WINDOW 0 31 76 Left 0 WINDOW 3 31 40 Left 0 SYMATTR InstName Lautsprecher SYMATTR Value 4 SYMBOL cap 160 272 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName Cein SYMATTR Value 100 SYMBOL cap 304 464 R0 SYMATTR InstName C2 SYMATTR Value 47 SYMBOL cap 640 256 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName Caus SYMATTR Value 2.2mF SYMBOL C:\Programme\LTSpice\lib\sym\voltage 32 352 R0 WINDOW 123 24 132 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName Quelle SYMATTR Value SINE(0 100m 1K) SYMATTR Value2 AC 100m SYMBOL C:\Programme\LTSpice\lib\sym\voltage -128 352 R0 SYMATTR InstName Ubat SYMATTR Value 24 ______________________________________________________________________________ Schon wieder Viren-Alarm? Bei WEB.DE FreeMail ist das kein Problem, hier ist der Virencheck inklusive!

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Re: Iteration problems

#917

Hello Mike,

Thank you, you have seen the problem. I'm sorry, next time I should check the ground node flag first.

Thanks again,

Bernhard
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Re: Iteration problems

#916

We can't run the circuit without the file TL071.lib, but one
drafting error that can be seen is that you didn't specifiy
what you meant as ground with the GND(node 0) flag.  Press F4,
select GND(global node 0) and connect it to the bottom of Ubat
and Quelle.

Normally LTspice will tell you that there's no ground
connection, but perhaps the opamp model called ground so it
doesn't know about the general circuit error.

--Mike

--- Bernhard_Kraemer@... wrote:
Hello, 

I have a simple OpAmp-circuit to simulate. I would like to get a .AC - Simulation from 1Hz to
30Khz, but the simulator starts endless iterations. Depending on the Opamp-Modell I am using,
the simulation stops immediatly (this was the case for one LT- OpAmp) with the message
"Iteration limit reached", or it starts these endless iterations and never comes to an end
(OpAmp TL071).
Ah! Another problem: For the transient analysis, I get values around 1 MegaVolt (instead of
MilliVolt)!
I wonder why the simulation doesn't run correctly, for it is a real simple circuit. I don't know
what to do now, because I don't have any experience with this kind of problems yet. 

It would be great if anyone could help me. 

Yours, 

  Bernhard Krmer

Here is the schematics :
(The TL071 circuit is attached)

Version 4
SHEET 1 892 692
WIRE 352 288 240 288
WIRE 240 368 240 288
WIRE 240 288 160 288
WIRE 240 288 240 208
WIRE 32 368 32 288
WIRE 32 288 96 288
WIRE 416 272 544 272
WIRE 320 368 320 256
WIRE 320 256 352 256
WIRE 320 256 320 192
WIRE 320 192 432 192
WIRE 512 192 544 192
WIRE 544 192 544 272
WIRE 544 272 576 272
WIRE 320 464 320 448
WIRE 640 272 688 272
WIRE 688 272 688 352
WIRE -128 368 -128 96
WIRE -128 96 240 96
WIRE 384 96 384 240
WIRE 240 128 240 96
WIRE 240 96 384 96
WIRE 384 304 384 544
WIRE 384 544 320 544
WIRE -128 544 -128 448
WIRE 32 448 32 544
WIRE 32 544 -128 544
WIRE 240 448 240 544
WIRE 240 544 32 544
WIRE 320 544 320 528
WIRE 320 544 240 544
WIRE 688 432 688 544
WIRE 688 544 384 544
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Opamps&#92;TL071 384 208 R0
SYMATTR InstName U1
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 224 112 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 224 352 R0
SYMATTR InstName R2
SYMATTR Value 1Meg
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 304 352 R0
SYMATTR InstName Rvor
SYMATTR Value 22K
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 528 176 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName Rgeg
SYMATTR Value 100K
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 704 448 R180
WINDOW 0 31 76 Left 0
WINDOW 3 31 40 Left 0
SYMATTR InstName Lautsprecher
SYMATTR Value 4
SYMBOL cap 160 272 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName Cein
SYMATTR Value 100
SYMBOL cap 304 464 R0
SYMATTR InstName C2
SYMATTR Value 47
SYMBOL cap 640 256 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName Caus
SYMATTR Value 2.2mF
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;voltage 32 352 R0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Quelle
SYMATTR Value SINE(0 100m 1K)
SYMATTR Value2 AC 100m
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;voltage -128 352 R0
SYMATTR InstName Ubat
SYMATTR Value 24
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Iteration problems

#915

Hello,

I have a simple OpAmp-circuit to simulate. I would like to get a .AC - Simulation from 1Hz to 30Khz, but the simulator starts endless iterations. Depending on the Opamp-Modell I am using, the simulation stops immediatly (this was the case for one LT- OpAmp) with the message "Iteration limit reached", or it starts these endless iterations and never comes to an end (OpAmp TL071).
Ah! Another problem: For the transient analysis, I get values around 1 MegaVolt (instead of MilliVolt)!
I wonder why the simulation doesn't run correctly, for it is a real simple circuit. I don't know what to do now, because I don't have any experience with this kind of problems yet. 

It would be great if anyone could help me.

Yours,

  Bernhard Kr?mer

Here is the schematics :
(The TL071 circuit is attached)

Version 4
SHEET 1 892 692
WIRE 352 288 240 288
WIRE 240 368 240 288
WIRE 240 288 160 288
WIRE 240 288 240 208
WIRE 32 368 32 288
WIRE 32 288 96 288
WIRE 416 272 544 272
WIRE 320 368 320 256
WIRE 320 256 352 256
WIRE 320 256 320 192
WIRE 320 192 432 192
WIRE 512 192 544 192
WIRE 544 192 544 272
WIRE 544 272 576 272
WIRE 320 464 320 448
WIRE 640 272 688 272
WIRE 688 272 688 352
WIRE -128 368 -128 96
WIRE -128 96 240 96
WIRE 384 96 384 240
WIRE 240 128 240 96
WIRE 240 96 384 96
WIRE 384 304 384 544
WIRE 384 544 320 544
WIRE -128 544 -128 448
WIRE 32 448 32 544
WIRE 32 544 -128 544
WIRE 240 448 240 544
WIRE 240 544 32 544
WIRE 320 544 320 528
WIRE 320 544 240 544
WIRE 688 432 688 544
WIRE 688 544 384 544
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Opamps&#92;TL071 384 208 R0
SYMATTR InstName U1
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 224 112 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 224 352 R0
SYMATTR InstName R2
SYMATTR Value 1Meg
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 304 352 R0
SYMATTR InstName Rvor
SYMATTR Value 22K
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 528 176 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName Rgeg
SYMATTR Value 100K
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;Misc&#92;EuropeanResistor 704 448 R180
WINDOW 0 31 76 Left 0
WINDOW 3 31 40 Left 0
SYMATTR InstName Lautsprecher
SYMATTR Value 4
SYMBOL cap 160 272 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName Cein
SYMATTR Value 100?
SYMBOL cap 304 464 R0
SYMATTR InstName C2
SYMATTR Value 47?
SYMBOL cap 640 256 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName Caus
SYMATTR Value 2.2mF
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;voltage 32 352 R0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Quelle
SYMATTR Value SINE(0 100m 1K)
SYMATTR Value2 AC 100m
SYMBOL C:&#92;Programme&#92;LTSpice&#92;lib&#92;sym&#92;voltage -128 352 R0
SYMATTR InstName Ubat
SYMATTR Value 24
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Re: Not even ... (lame parameter stepping)

#914

Oh, yes, now I see the problem.  There was a problem introduced.
If you add the line ".param R=5K" the circuit will fail
but the line2 ".param" or ".param R=5K nix=3K" will not
cause it to fail.  There be an update next week(we're on
vacation today and tomorrow) that will also accept the old
syntax.

Thanks for reporting the problem.

--Mike

--- analogspiceman <analogspiceman@...> wrote:
Panama Mike, analog wrote:
 
One of my favorite features is hobbled.  :( :(
Mike, please make it whole again. 

Version 2.03r June 30th.I didn't know that it was broken.  There was recent change
to make globally .step'ed parameters accessible in subcircuits
if not defined at a more local scope, so maybe something
else broke when I fixed that.  Can you e-mail an example
that shows the problem?  Here's a deck that would indicate
that parameter stepping works:

* example parameter stepping
V1 1 0 pulse(0 1 0 1u 1u .5m 1m)
R1 1 2 {R}
C1 2 0 .1u
.step param R list 1K 2K 3K
.tran 3m
.endWhen param stepping suddenly went lame in circuit file at work where 
it used to run like a champ, the first thing I did was to make up a 
test circuit *almost* exactly like the working example you just 
listed.  And it didn't run.  

The key difference seems to be that my file includes the following 
additional spice command: ".param R=1k".  

This seemingly unnecessary "double definition" was required in Pspice 
syntax and never used to trip up LTspice.  Seems like you might want 
to maintain the Pspice compatibility.  But whatever you do, I'm still 
going to think LTspice is the greatest (lame jokes aside).



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Re: Not even ... (lame parameter stepping)

#913

Panama Mike, analog wrote:
 
One of my favorite features is hobbled.  :( :(
Mike, please make it whole again. 

Version 2.03r June 30th.I didn't know that it was broken.  There was recent change
to make globally .step'ed parameters accessible in subcircuits
if not defined at a more local scope, so maybe something
else broke when I fixed that.  Can you e-mail an example
that shows the problem?  Here's a deck that would indicate
that parameter stepping works:

* example parameter stepping
V1 1 0 pulse(0 1 0 1u 1u .5m 1m)
R1 1 2 {R}
C1 2 0 .1u
.step param R list 1K 2K 3K
.tran 3m
.endWhen param stepping suddenly went lame in circuit file at work where 
it used to run like a champ, the first thing I did was to make up a 
test circuit *almost* exactly like the working example you just 
listed.  And it didn't run.  

The key difference seems to be that my file includes the following 
additional spice command: ".param R=1k".  

This seemingly unnecessary "double definition" was required in Pspice 
syntax and never used to trip up LTspice.  Seems like you might want 
to maintain the Pspice compatibility.  But whatever you do, I'm still 
going to think LTspice is the greatest (lame jokes aside).

Re: Not even limping, parameter stepping now lame and refuses to budge!

#912

Analog,

One of my favorite features is hobbled.  :( :(
Mike, please make it whole again. 

Version 2.03r June 30th.I didn't know that it was broken.  There was recent change
to make globally .step'ed parameters accessible in subcircuits
if not defined at a more local scope, so maybe something
else broke when I fixed that.  Can you e-mail an example
that shows the problem?  Here's a deck that would indicate
that parameter stepping works:

* example parameter stepping
V1 1 0 pulse(0 1 0 1u 1u .5m 1m)
R1 1 2 {R}
C1 2 0 .1u
.step param R list 1K 2K 3K
.tran 3m
.end

PS: I noticed that LTspice parses ".aliases" and ".endalises" but 
doesn't seem to make use of the information in the waveform viewer.  
Is this just there for Pspice compatibility or does the command do 
anything?The commands are "recognized" in that they don't cause errors, but
otherwise ignored.

--Mike

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Spice Model for ST L2726

JOHN RATHE

#911

Hello-

I'm looking for a spice model for an ST Microelectronics L2726 Dual Power Op Amp. Does anyone have one?

Thanks

John

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Not even limping, parameter stepping now lame and refuses to budge!

#910

One of my favorite features is hobbled.  :( :(
Mike, please make it whole again. 

Version 2.03r June 30th.

Thanks.

PS: I noticed that LTspice parses ".aliases" and ".endalises" but 
doesn't seem to make use of the information in the waveform viewer.  
Is this just there for Pspice compatibility or does the command do 
anything?

Re: Bug in "Help" files? (Re: Bug in "Waveform Arithmetic"?)

#909

These functions are now available in the waveform compiler
in version 2.03r.  Thanks again for pointing out the problem.

--Mike

--- Dale <dchishol@...> wrote:
I checked the "Help".  On my installation (ver 2.03q, 27 Jun 2003) the
topic called "Waveform Arithmetic" includes some sexy full-color
screen captures and most definitely lists :

"            int(x) | convert x to integer
           floor(x) | integer equal or less than x
            ceil(x) | integer equal or greater than x  "

among the allowed functions.

The topic for "G. Voltage Dependent Current Source" is a little bit
ambiguous; the fourth form of syntax is described as :

"Syntax:  Gxxx n+ n- value={<expression>}

This is an alternative syntax of the behavioral source, arbitrary
behavioral voltage source, B. "

which I took to mean that any expression legal for a "B" source could
also be used for the "G" source.

Certainly, the program behavior I observed is not entirely consistent
with the "Help" file content but I'm not sure which is correct. 

Dale




--- In LTspice@..., "analogspiceman" <analogspiceman@y...>
wrote:
--- In LTspice@..., "Dale" <dchishol@c...> wrote:
When entering a waveform expression using the "int()", "ceil()" or
"floor()" functions I get error messages that "int" (or "ceil" or
"floor") is an undefined symbol.  For the record, the expression I'm
entering is:

int(32*V(3)/(2*pi))

and "V(3)" is a valid node voltage in my simulation.

Am I doing something wrong, or is this a program bug?

Thanks for suggestions
Dale

p.s. -  I've also had problems using the sgn() function in 
expressions for the "F" and "G" sources, though it seems to work 
with "B" sources.Hello,

The functions you named are not valid for waveform arithmetic and may 
only be used in behavioral sources.  Check the help file.  Or better 
still, check my included crib sheet which contains many functions not 
listed in the help file as well several corrections to errors there.
    > - - -  Remainder Truncated  - - - <


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Re: Bug in "Help" files? (Re: Bug in "Waveform Arithmetic"?)

#908

It was error in the help file.  Those functions were never
part of the waveform expression compiler.  But I'll add
them.  There's be an update next week that will include
them for real waveform math so the program matches the
help.

Thanks for pointing out the problem.

--Mike

--- Dale <dchishol@...> wrote:
I checked the "Help".  On my installation (ver 2.03q, 27 Jun 2003) the
topic called "Waveform Arithmetic" includes some sexy full-color
screen captures and most definitely lists :

"            int(x) | convert x to integer
           floor(x) | integer equal or less than x
            ceil(x) | integer equal or greater than x  "

among the allowed functions.

The topic for "G. Voltage Dependent Current Source" is a little bit
ambiguous; the fourth form of syntax is described as :

"Syntax:  Gxxx n+ n- value={<expression>}

This is an alternative syntax of the behavioral source, arbitrary
behavioral voltage source, B. "

which I took to mean that any expression legal for a "B" source could
also be used for the "G" source.

Certainly, the program behavior I observed is not entirely consistent
with the "Help" file content but I'm not sure which is correct. 

Dale




--- In LTspice@..., "analogspiceman" <analogspiceman@y...>
wrote:
--- In LTspice@..., "Dale" <dchishol@c...> wrote:
When entering a waveform expression using the "int()", "ceil()" or
"floor()" functions I get error messages that "int" (or "ceil" or
"floor") is an undefined symbol.  For the record, the expression I'm
entering is:

int(32*V(3)/(2*pi))

and "V(3)" is a valid node voltage in my simulation.

Am I doing something wrong, or is this a program bug?

Thanks for suggestions
Dale

p.s. -  I've also had problems using the sgn() function in 
expressions for the "F" and "G" sources, though it seems to work 
with "B" sources.Hello,

The functions you named are not valid for waveform arithmetic and may 
only be used in behavioral sources.  Check the help file.  Or better 
still, check my included crib sheet which contains many functions not 
listed in the help file as well several corrections to errors there.
    > - - -  Remainder Truncated  - - - <


__________________________________
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Bug in "Help" files? (Re: Bug in "Waveform Arithmetic"?)

Dale

#907

I checked the "Help".  On my installation (ver 2.03q, 27 Jun 2003) the
topic called "Waveform Arithmetic" includes some sexy full-color
screen captures and most definitely lists :

"            int(x) | convert x to integer
           floor(x) | integer equal or less than x
            ceil(x) | integer equal or greater than x  "

among the allowed functions.

The topic for "G. Voltage Dependent Current Source" is a little bit
ambiguous; the fourth form of syntax is described as :

"Syntax:  Gxxx n+ n- value={<expression>}

This is an alternative syntax of the behavioral source, arbitrary
behavioral voltage source, B. "

which I took to mean that any expression legal for a "B" source could
also be used for the "G" source.

Certainly, the program behavior I observed is not entirely consistent
with the "Help" file content but I'm not sure which is correct. 

Dale




--- In LTspice@..., "analogspiceman" <analogspiceman@y...>
wrote:
--- In LTspice@..., "Dale" <dchishol@c...> wrote:
When entering a waveform expression using the "int()", "ceil()" or
"floor()" functions I get error messages that "int" (or "ceil" or
"floor") is an undefined symbol.  For the record, the expression I'm
entering is:

int(32*V(3)/(2*pi))

and "V(3)" is a valid node voltage in my simulation.

Am I doing something wrong, or is this a program bug?

Thanks for suggestions
Dale

p.s. -  I've also had problems using the sgn() function in 
expressions for the "F" and "G" sources, though it seems to work 
with "B" sources.Hello,

The functions you named are not valid for waveform arithmetic and may 
only be used in behavioral sources.  Check the help file.  Or better 
still, check my included crib sheet which contains many functions not 
listed in the help file as well several corrections to errors there.
    > - - -  Remainder Truncated  - - - <

Re: Bug in "Waveform Arithmetic"?

#906

--- In LTspice@..., "analogspiceman" <analogspiceman@y...> 
wrote:
 ...
The functions you named are not valid for waveform arithmetic and 
may only be used in behavioral sources.  Check the help file.  Or 
better  still, check my included crib sheet which contains many 
functions not listed in the help file as well several corrections 
to errors there.[cut mangled text]

Well, that text still had all the white space when I previewed it!  I 
guess Yahoo Groups removes white space.  Will have to repost the 
crib sheet in the files section.

Re: Bug in "Waveform Arithmetic"?

Steve Steckler

#905

you might try V(n003)

analogspiceman wrote:

--- In LTspice@..., "Dale" wrote: > When entering a waveform expression using the "int()", "ceil()" or > "floor()" functions I get error messages that "int" (or "ceil" or > "floor") is an undefined symbol.? For the record, the expression I'm > entering is: > > int(32*V(3)/(2*pi)) > > and "V(3)" is a valid node voltage in my simulation. > > Am I doing something wrong, or is this a program bug? > > Thanks for suggestions > Dale > > p.s. -? I've also had problems using the sgn() function in > expressions for the "F" and "G" sources, though it seems to work > with "B" sources. Hello, The functions you named are not valid for waveform arithmetic and may only be used in behavioral sources.? Check the help file.? Or better still, check my included crib sheet which contains many functions not listed in the help file as well several corrections to errors there. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Waveform Arithmetic: The difference of two voltages; e.g., V(a)-V(b); can equivalently written as V(a,b).? The following functions are available (r denotes real data only, c denotes complex data only): ????????????? Name? | Function -------------------+----------------------------- ???????????? sin(x) | sine ???????????? cos(x) | cosine ???????????? tan(x) | tangent ??????????? asin(x) | arc sine ??????????? acos(x) | arc cosine ??????????? atan(x) | arc tangent ???????? atan2(y,x) r arc tangent of y/x ???????? hypot(y,x) r hypotenuse: sqrt(x*x+y*y) ??????????? sinh(x) | hyperbolic sine ??????????? cosh(x) | hyperbolic cosine ??????????? tanh(x) | hyperbolic tangent ?????????? asinh(x) | arc hyperbolic sine ?????????? acosh(x) | arc hyperbolic cosine ?????????? atanh(x) | arc hyperbolic tangent ???????????? exp(x) | exponential ??? ln(x) or log(x) | natural logarithm ?????????? log10(x) | base 10 logarithm ???????????? sgn(x) r sign (0 if x = 0) ??????????? fabs(x) r absolute value ???????????? abs(x) | absolute value ??????????? sqrt(x) | square root ??????????? cbrt(x) | cube root ?????????? pow(x,y) r x**y ?????????? pwr(x,y) r abs(x)**y ????????? pwrs(x,y) r sgn(x)*abs(x)**y ?????????? min(x,y) r the lesser of x or y ?????????? max(x,y) r the greater of x or y ?????? limit(x,y,z) r equivalent to min(max(x,y),z) ? table(x,x1,y1...) r interpolate values for x ??? where: x1??????????????????? r?? of x-ordered point pairs ?????????? uramp(x) r x if x > 0, else 0 ?????????????? u(x) r unit step: 1 if x > 0, else 0 ???????????? buf(x) r 1 if x > .5, else 0 ???? !(x) or inv(x) r 0 if x > .5, else 1 ??????????? rand(x) r random number between 0 and 1? ????????????? re(x) c real part ????????????? im(x) c imaginary part ????????????? ph(x) c phase ???????????? mag(x) c magnitude ????????????? db(x) c magnitude in dB ?????????? invdb(x) c 10**(x/20) Waveform Arithmetic (continued): The following operations, grouped in order of precedence of evaluation (for complex data only +, -, *, /, and ** are available): ? Symbol | Operation --------+-------------------------------------------------- ???? !?? | convert succeeding expression to Boolean then ???????? |?? invert ??? **?? | floating point exponentiation --------+-------------------------------------------------- ???? /?? | floating point division ???? *?? | floating point multiplication ???? %?? | floating point modulus (real data only) --------+-------------------------------------------------- ???? -?? | floating point subtraction ???? +?? | floating point addition --------+-------------------------------------------------- ??? ==?? | true if preceding expression is equal to ???????? |?? succeeding expression, otherwise false ??? >=?? | true if preceding expression is greater than or ???????? |?? equal to succeeding expression, otherwise false ??? <=?? | true if preceding expression is less than or ???????? |?? equal to succeeding expression, otherwise false ???? >?? | true if preceding expression is greater than ???????? |?? succeeding expression, otherwise false ???? <?? | true if preceding expression is less than ???????? |?? succeeding expression, otherwise false --------+-------------------------------------------------- ???? ^?? | convert adjacent expressions to Boolean then XOR ???? |?? | convert adjacent expressions to Boolean then OR ???? &?? | convert adjacent expressions to Boolean then AND True is numerically equal to 1 and False is 0.? Conversion to Boolean converts a value to 1 if the value is greater than 0.5, otherwise the value is converted to 0. The following keywords (global variables and constants): ?? Name? |???? Value???? | Description ---------+---------------+---------------------------------- ? time?? |??? variable?? | time in seconds (real data only) ? freq?? |??? variable?? | freq in Hertz?? (cmplx data only) ??? w??? |??? variable?? | freq in radians (cmplx data only) ??? i??? |? sqrt(-1)???? | imaginary unity (cmplx data only) ??? e??? |? 2.71828????? | ?? pi??? |? 3.14159????? | ??? c??? |? 2.99792e+008 | speed of light in m/s ? boltz? |? 1.38062e-023 | Boltzmann constant planck? |? 6.62620e-034 | Planck's constant echarge |? 1.60219e-019 | charge of an electron kelvin? | -2.73150e+002 | absolute zero in degrees C B.? Arbitrary behavioral voltage or current sources. Symbol names: BV, BI Syntax:? Bxxx n1 n2 V= ???????? + [[ic=] tripdv=] [tripdt=] ???????? + [Laplace= [window=] [nfft=]] ???????? Bxxx n1 n2 I= [Rpar=] ???????? + [ic=] [tripdv=] [tripdt=] ???????? + [Laplace= [window=] [nfft=]] The first syntax specifies a behavioral voltage source and the next is a behavioral current source.? For the current source, a parallel resistance may be specified with the Rpar instance parameter. Tripdv and tripdt control step rejection.? If the voltage across a source changes by more than tripdv volts in tripdt seconds, that simulation time step is rejected. The transfer function of the Laplace circuit element is specified by its Laplace transform.? The Laplace transform must be a function of s. The frequency response at frequency f is found by substituting s with sqrt(-1)*2*pi*f.? The time domain behavior is found from the impulse response obtained from the Fourier transform of the frequency domain response.? LTspice must guess an appropriate frequency range and resolution.? The response must drop at high frequencies or an error is reported.? It is recommended that the LTspice first be allowed to make a guess at this and then check the accuracy by reducing reltol or explicitly setting nfft and the window.? The reciprocal of the value of the window is the frequency resolution. The value of nfft times this resolution is the highest frequency considered. Expressions can contain the following: o????? Node voltages, e.g., V(n1) o????? Node voltage differences, e.g., V(n1,n2) o????? Circuit element currents; for example, I(S1), the current through switch S1 or Ib(Q1), the base current of Q1.? However, it is assumed that the circuit element current is varying quasi-statically, that is, there is no instantaneous feedback between the current through the referenced device and the behavioral source output. o????? The keyword "time" meaning the current time in the simulation. o????? Any user defined parameters or functions.? For details, refer to the .param and the .func simulator directives defined under the Help subchapter on Dot Commands. B.? Arbitrary behavioral voltage or current sources (continued). o????? The following functions: ????????????? Name? | Function -------------------+----------------------------- ???????????? sin(x) | sine ???????????? cos(x) | cosine ???????????? tan(x) | tangent ??????????? asin(x) | arc sine ??????????? acos(x) | arc cosine ??????????? atan(x) | arc tangent ???????? atan2(y,x) | arc tangent of y/x ???????? hypot(y,x) | hypotenuse: sqrt(x*x+y*y) ??????????? sinh(x) | hyperbolic sine ??????????? cosh(x) | hyperbolic cosine ??????????? tanh(x) | hyperbolic tangent ?????????? asinh(x) | arc hyperbolic sine ?????????? acosh(x) | arc hyperbolic cosine ?????????? atanh(x) | arc hyperbolic tangent ???????????? exp(x) | exponential ??? ln(x) or log(x) | natural logarithm ?????????? log10(x) | base 10 logarithm ???????????? sgn(x) | sign (0 if x = 0) ???????????? abs(x) | absolute value ??????????? sqrt(x) | square root ????????? square(x) | x**2 ?????????? pow(x,y) | x**y ?????????? pwr(x,y) | abs(x)**y ????????? pwrs(x,y) | sgn(x)*abs(x)**y ?????????? round(x) | round to nearest integer ???????????? int(x) | truncate to integer part of x ?????????? floor(x) | integer equal or less than x ??????????? ceil(x) | integer equal or greater than x ?????????? min(x,y) | the lesser of x or y ?????????? max(x,y) | the greater of x or y ?????? limit(x,y,z) | equivalent to min(max(x,y),z) ????????? if(x,y,z) | if x > .5 then y else z ? table(x,x1,y1...) | interpolate values for x ??? where: x1??????????????????? |?? of x-ordered point pairs ?????????? uramp(x) | x if x > 0, else 0. ???? u(x) or stp(x) | unit step, 1 if x > 0, else 0 ???????????? buf(x) | 1 if x > .5, else 0 ???? !(x) or inv(x) | 0 if x > .5, else 1 ??????????? rand(x) | random number between 0 and 1 ???????????? ddt(x) | time derivative ?? idt(x) or sdt(x) | time integral: idt(x[,ic[,assert]])? ????????? idtmod(x) | time integral with wrapping at 2*Pi ??????????????????? |?? idtmod(x[,ic[,mod[,offset]]])? ???????? delay(x,y) | delay x by y seconds ????? absdelay(x,y) | absdelay(x,delay[,max_delay])? B.? Arbitrary behavioral voltage or current sources (continued). o????? The following operations, grouped in order of precedence of evaluation: ? Symbol | Operation --------+-------------------------------------------------- ? ~ or ! | convert succeeding expression to Boolean then ???????? |?? invert ??? **?? | floating point exponentiation --------+-------------------------------------------------- ???? /?? | floating point division ???? *?? | floating point multiplication --------+-------------------------------------------------- ???? -?? | floating point subtraction ???? +?? | floating point addition --------+-------------------------------------------------- ??? ==?? | true if preceding expression is equal to ???????? |?? succeeding expression, otherwise false ??? >=?? | true if preceding expression is greater than or ???????? |?? equal to succeeding expression, otherwise false ??? <=?? | true if preceding expression is less than or ???????? |?? equal to succeeding expression, otherwise false ???? >?? | true if preceding expression is greater than ???????? |?? succeeding expression, otherwise false ???? <?? | true if preceding expression is less than ???????? |?? succeeding expression, otherwise false --------+-------------------------------------------------- ???? ^?? | convert adjacent expressions to Boolean then XOR ???? |?? | convert adjacent expressions to Boolean then OR ???? &?? | convert adjacent expressions to Boolean then AND True is numerically equal to 1 and False is 0.? Conversion to Boolean converts a value to 1 if the value is greater than 0.5, otherwise the value is converted to 0. o????? The following keywords (global variables and constants): ?? Name? |???? Value???? | Description ---------+---------------+---------------------------------- ? time?? |??? variable?? | time in seconds ?? pi??? |? 3.14159????? | ? boltz? |? 1.38062e-023 | Boltzmann constant planck? |? 6.62620e-034 | Planck's constant echarge |? 1.60219e-019 | charge of an electron kelvin? | -2.73150e+002 | absolute zero in degrees C

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