Forgot to say:

.subckt NMOS 3 1 2

actually means that the first pin is 3, then the 2nd is 1 and the 3rd
is 2, the numbers are interpreted literally, not numerically. Just an
example to show that the order is what counts.


Vlad
______________________
ltspicegoodies.ltwiki.org -- holding, among others:
a universal analog/digital filter, block-level models
for power electronics (and not only), math blocks
with a more stream-lined approach, some digital
ADC, DAC, (synchronous-)counter, JKflop, etc.

Helmut,

Thank you.? I originally wanted to use nmos, but I didn't find Ctrl-right mouse to change the prefix,
so I did it the hard way, but didn't know to set the Prefix and Value.in the ASY.

I also have a model file, which I suspect can be connected directly to the nmos symbol, but again I did not figure out how to do that.

In this case the order of the pins matched without changing anything, but if use use nmos, how should one fix a pin order mismatch between the symbol and the SUBBCKT?

Brian

Hello Brian,
You forgot to set two values in the symbol(.asy).

Prefix:X
Value:BSH103

LTspice assumed a hierarchical schematic due to of these missing attributes and failed because you don't have a hierarchical schematic.

You don't need a special symbol for Mosfet with subcircuits. It's much easier to simply use the symbol "nmos" or "pmos" and make it ready for a subcircuit in the schematic.
?
Place the symbol "nmos"
Ctrl-right mouse-click on it
Change Prefix:MN to X
Change Value:nmos to BSH103
OK

Add a SPICE-directive to include the model file as shown below.
.include BSH103_8_20_2010.lib

I have uploaded an example to the Files section.

Files > Lib > BSH103_8_20_2010_test.zip


Just unzip this example into any folder, but never make any of your own folders below C:\Program ...

Best regards,
Helmut

?

All,

I uploaded BSH103_test.zip.? I am attempting to make the BSH103 subckt work.

The simulation seems to rn, but emits a warning which I recognize as being about the
pin names in the ASY file, but I can find no explanation of the meaning or how to fix it.

I mostly want to understand what this warning means so I can fix it myself.

Brian

All,

I uploaded a file called BSBH103_test,zip.
I am attempting to use the subckt file for the BSH103.
The run seems to work, but there is a warning that I have been unable to decipher.
I recognize the subject of the warning as being the names of the pins in the ASY file,
but have been unable to determine how to fix it.

I am mostly looking for understanding of the warning so I can fix it.
Brian

Getting the breadboard to work involves paying more attention to the data sheet and app notes than to the model.

The LT1241 series is intended to be pin-compatible with UC3842 series.

RL

> "Winfield Hill" winfieldhill

>
>Jim, what do suggest using for varacters these days?
>
>- Win
>
>Winfield Hill
>Rowland Institute at Harvard
>100 Edwin Land Blvd
>Cambridge, MA 02142
>
>617-497-4670

Hi Win, How's it going?

I don't have a particular varactor/varicap that I'm fond of using.? Recent chips have used an on-board MOS device as a varicap (at ~5GHz).

In the past the customer usually has an LC system already in mind, and I provide the oscillator core and level-shifting required (and the AGC).





America: Land of the Free, Because of the Brave

Thank you Helmut,



One is never too old to earn.



Theunis



From: LTspice@... [mailto:LTspice@...]
Sent: Sunday, June 01, 2014 12:57 PM
To: LTspice@...
Subject: RE: [LTspice] Re: uc3842





Hello Theunis,

It would be bad practice to store something in the installation folders of LTspice.

Copy the symbols(.asy) and the model file(s) in the folder of your schematic.
You will then reach the extra symbols by setting the "Top directory" in the "Add Component"-dialog.
Press F2 then choose the "Top directory".

Your schematic folders should never be under C:\Program ...

Best regards,
Helmut





[Non-text portions of this message have been removed]

Hello Theunis,

It would be bad practice to store something in the installation folders of LTspice.

Copy the symbols(.asy) and the model file(s) in the folder of your schematic.
You will then reach the extra symbols by setting the "Top directory" in the "Add Component"-dialog.
Press F2 then choose the "Top directory".

Your schematic folders should never be under C:\Program ...

Best regards,
Helmut

Thanks Helmut

Thanks Bud will do.





From: LTspice@... [mailto:LTspice@...]
Sent: Sunday, June 01, 2014 12:08 PM
To: LTspice@...
Subject: [LTspice] Re: uc3842





Hello,

At least one more chance, but I assume the model from analogspiceman mentioned in my previous answer is better.




Please also search in "all_files.htm" for more examples using the UC3842. This "all_files.htm" contains links to all files of this group.





Best regards,
Helmut





[Non-text portions of this message have been removed]

Hello,

At least one more chance, but I assume the model from analogspiceman mentioned in my previous answer is better.




Please also search in "all_files.htm" for more examples using the UC3842. This "all_files.htm" contains links to all files of this group.

? ?

?

Best regards,
Helmut

Helllo,

Take? a look here.



Bet regards,
Helmut

?

There is one in the standard component menu for diodes in LTspice. I tend to use that one for applications that need something in the range of 2-10pf.

开云体育

?Jim, what do suggest using for varacters these days?

-- 
   - Win

Winfield Hill
Rowland Institute at Harvard
100 Edwin Land Blvd
Cambridge, MA  02142

617-497-4670