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Re: Determining the value of a variable at time t-1
feabyl wrote:
How to implement an expression D(t)=D(t-1)+ a ? Is that D(t-1) as in D(t - 1sec)? If so, you can implement a 1 second time delay in either of two ways: 1. A (properly terminated) lossless transmission line (T-element) with a delay of 1 second. 2. A behavioral source (B-element) with a delay of 1 second. If the '-1' is supposed to represent the previous internal timestep in LTspice, I don't think there is a way to do that. (But I'm not saying it is impossible.) Regards, Andy (PS: I'm not quite sure what you are trying to achieve with that expression, but I hope you know what you are doing there.) |
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Re: A TVS does not work with load dump test??
alzie wrote:
Ohms law says that your current is over 20A Quite a lot for a little TVS. You may need to use a real SCR crow bar and a fuse to be safe.The TVS may be sufficient. Like you say, they are meant to handle short spikes, and that might be all that it ever sees ... ignition noise and such. The instantaneous power could be up there but it's not wide enough to heat up the device. The simulated waveform is probably very pessimistic. Andy |
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Re: A TVS does not work with load dump test??
Hi eqmqiq
On 07/10/2013 01:44 AM, eqmqiq wrote: Thanks for everyone's suggestion, I put a new TVS from the LTspice Ohms law says that your current is over 20A Quite a lot for a little TVS. Theyre usually meant for short spikes. 20A * 36V = 720W That would convert youre TVS into a SED in short order. (smoke emitting device) You may need to use a real SCR crow bar and a fuse to be safe. -- AC2CL I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything. - Nikola Tesla |
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Re: Integrate and dump signal
--- In LTspice@..., "suri_bright" <nghoang_98@...> wrote:
Hi all, I would like to create the integrate and dump in LTspiceYes, I do, but please go - go to where you may find the knowledge of ALL the yummy, delicious brains forever preserved for your eternal consumption in the great secret brain lockers known as the group Message Archive and the Magical Help File. The key password you will need is... "idt reset". Now, go, go away. Begone o' Zombie. PS: There are those who claim that homework zombieism may be cured through much personal initiative, hard work and the willingness to actually experiment with the brain-ware (i.e., LTspice). Yum! |
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Re: import Touchstone file (s2p) to LTSpice
Look at the line that starts the definition of the subcircuit.
? ? .SUBCKT 06HPR33 1 2 3 You will notice that the subcircuit has 3 external nodes (1 2 3). The native inductor has only two external nodes. You cannot use the inductor symbol and assign this subcircuit to it because of the node mismatch. If you look in the Files section of this group, ? Files > Tut > S-Parameter > S-Parameter to SPICE you will find a symbol file for a 2-port device (S2PORT.asy). Your s-parameter file is a 2-port file as designated by the extension .s2p. You will notice that the 2-port symbol has three external nodes. Two of them connect to the nodes in your circuit where you would connect the inductor. The third node is ground. ? ? ________________________________ From: ayman_hendawy <ayman_hendawy@...> To: LTspice@... Sent: Wednesday, July 10, 2013 6:50 AM Subject: [LTspice] import Touchstone file (s2p) to LTSpice ? Hi, I have ".s2p" files of some inductors and I need to import this file as a model to the inductors I have drawn in LTSpice in order to use it in the simulation, in order to do a practical simulation. I downloaded the "s2spice_097.exe" from the "group files" and generate the .lib file, I get a file like this: /***/ .SUBCKT 06HPR33 1 2 3 * MHz S MA R 50 * Z1=50.000000 Z2=50.000000 R1N 1 10 -5.000000e+001 R1P 10 11 1.000000e+002 R2N 2 20 -5.000000e+001 R2P 20 21 1.000000e+002 *S11 FREQ MAG PHASE E11 11 12 FREQ {V(10,3)}= MAG +( 1.000000e+006, 4.400000e-002, 2.585500e+001) +( 1.047000e+006, 4.400000e-002, 2.681900e+001) +( 1.097000e+006, 4.500000e-002, 2.780500e+001) . . . /**/ Then I added to my inductor in the spicemodel field: 06HPR33 , and add in the spice directive the following: .lib "the path to my .lib file". But when I run the simulation I get nothing for the inductor, so kindly advice what I'm doing wrong. Thanks |
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Integrate and dump signal
Hi all, I would like to create the integrate and dump in LTspice (the same with integrate and dump block in Matlab). I can create the integrate by the equivalent idt() with bv.asv. However, I do not know how to dump the signal. Is there any one know how to do please help? Thanks
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Re: low noise amplifier
Hi Ferdian Cahyodwiputro.
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I created a small electronic circuit to test the model. Using this scheme, I found that the description of the transistor pins are in non-standard order. I will put circuit in the TEMP folder. Bordodynov. 10.07.2013, 15:33, "Ferdian Cahyodwiputro" <ferdiancahyodwiputro@...>: Hi Mr. §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó |
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Re: low noise amplifier
Ferdian Cahyodwiputro
Hi Mr. §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó
can you upload this component? because i still can't understand to create new component.. i'm still newbe ________________________________ From: Ferdian Cahyodwiputro <ferdiancahyodwiputro@...> To: "LTspice@..." <LTspice@...> Sent: Wednesday, July 10, 2013 6:22 PM Subject: Re: [LTspice] low noise amplifier ? thank you.. this conversation helpfull my trouble. ________________________________ From: §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó <BordodunovAlex@...> To: "LTspice@..." <ltspice@...> Sent: Wednesday, July 10, 2013 5:06 PM Subject: Re: [LTspice] low noise amplifier ? ==>HELP==>F.A.Q==>Third-party Models--> ..... Example for a 3-pin NPN transistor but defined with a .SUBCKT statement: ..... Bordodynov. 10.07.2013, 13:55, "Ferdian Cahyodwiputro" <ferdiancahyodwiputro@...>: thank you for your information by the way so i must create new design symbol with this parameter?[Non-text portions of this message have been removed] [Non-text portions of this message have been removed] |
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Re: low noise amplifier
Ferdian Cahyodwiputro
thank you..
this conversation helpfull my trouble. ________________________________ From: §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó <BordodunovAlex@...> To: "LTspice@..." <ltspice@...> Sent: Wednesday, July 10, 2013 5:06 PM Subject: Re: [LTspice] low noise amplifier ? ==>HELP==>F.A.Q==>Third-party Models--> ..... Example for a 3-pin NPN transistor but defined with a .SUBCKT statement: ..... Bordodynov. 10.07.2013, 13:55, "Ferdian Cahyodwiputro" <ferdiancahyodwiputro@...>: thank you for your information by the way so i must create new design symbol with this parameter? |
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import Touchstone file (s2p) to LTSpice
Hi,
I have ".s2p" files of some inductors and I need to import this file as a model to the inductors I have drawn in LTSpice in order to use it in the simulation, in order to do a practical simulation. I downloaded the "s2spice_097.exe" from the "group files" and generate the .lib file, I get a file like this: /***/ .SUBCKT 06HPR33 1 2 3 * MHz S MA R 50 * Z1=50.000000 Z2=50.000000 R1N 1 10 -5.000000e+001 R1P 10 11 1.000000e+002 R2N 2 20 -5.000000e+001 R2P 20 21 1.000000e+002 *S11 FREQ MAG PHASE E11 11 12 FREQ {V(10,3)}= MAG +( 1.000000e+006, 4.400000e-002, 2.585500e+001) +( 1.047000e+006, 4.400000e-002, 2.681900e+001) +( 1.097000e+006, 4.500000e-002, 2.780500e+001) . . . /**/ Then I added to my inductor in the spicemodel field: 06HPR33 , and add in the spice directive the following: .lib "the path to my .lib file". But when I run the simulation I get nothing for the inductor, so kindly advice what I'm doing wrong. Thanks |
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Re: low noise amplifier
==>HELP==>F.A.Q==>Third-party Models-->
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..... Example for a 3-pin NPN transistor but defined with a .SUBCKT statement: ..... Bordodynov. 10.07.2013, 13:55, "Ferdian Cahyodwiputro" <ferdiancahyodwiputro@...>: thank you for your information by the way so i must create new design symbol with this parameter? |
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Re: low noise amplifier
Ferdian Cahyodwiputro
thank you for your information by the way so i must create new design symbol with this parameter?
________________________________ From: §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó <BordodunovAlex@...> To: "LTspice@..." <ltspice@...> Sent: Wednesday, July 10, 2013 12:21 PM Subject: Re: [LTspice] low noise amplifier ? Hi. Model: .SUBCKT q2SC5006_v111 7 8 9 Ccb 2 5 58f Cce 2 6 87f Cbe 7 9 0.67f Cb 1 2 180f Ce 2 3 180f Lb 5 7 1.09n Lc 2 8 0.79n Le 6 9 0.99n Lb2 1 5 0.004n Le2 3 6 0.004n Qnpn 2 1 3 q2SC5006_v111_M .MODEL q2SC5006_v111_M NPN +(IS=616e-18 BF=161 NF=0.99 VAF=50.0 + IKF=1.5 BR=14.4 NR=0.99 VAR=2.4 + IKR=0.32 ISE=38.2e-14 NE=2.19 ISC=80e-17 + NC=1.0 RB=4.37 IRB=759e-6 RBM=2.23 + RE=0.4 RC=5.0 CJE=2.21p VJE=0.954 + MJE=0.408 CJC=1p VJC=0.667 MJC=0.408 + XCJC=0.8 + FC=0.50 TF=20.0e-12 XTF=1e-3 VTF=0.668 +ITF=9.7 TR=0 PTF=40 EG=1.11 + XTI=3.0 XTB=0) .ENDS q2SC5006_v111 Bordodynov. 10.07.2013, 08:20, "ferdiancahyodwiputro" <ferdiancahyodwiputro@...>: dear everyone [Non-text portions of this message have been removed] |
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Re: A TVS does not work with load dump test??
I got it, thanks for all your suggestions.
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--- In LTspice@..., Jim Wagner <wagnejam99@...> wrote:
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Re: locking the graph vertical axis
Tony Casey
--- In LTspice@..., Kevin Cobley <kevin.cobley@...> wrote:
Hello Kevin, This topic comes up regularly (last week in fact). The solution to this is once you have adjusted the scales to your satisfaction, save the plot settings: - Make sure the plot window is active - Menu=>Plot Settings=>Save Plot Settings - After each simulation, Menu=>Plot Settings=>Reload Plot Settings It is very helpful to assign a hot key to this command - many people use the spacebar. To do this, from the control panel (hammer icon): Waveforms tab=>Hot Keys You can assign a large number of menu commands to hot keys; many are pre-assigned, by default. Regards, Tony |
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Re: A TVS does not work with load dump test??
Important intuitive point - TVS does not have sharp breakdown like a zener.
Note, carefully Bordodynov's specs. Breakdown (probably at 10-100mA) of 26.7V to 29.5V. Conduction voltage rises 9V by the time the conduction current rises to 15.4A. Of course, no ordinary zener can handle that sort of current. Jim Wagner Oregon Research Electronics On Jul 9, 2013, at 11:03 PM, §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó wrote: All you get it right. Carefully study the documentation for the complete set. [Non-text portions of this message have been removed] |
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Re: A TVS does not work with load dump test??
All you get it right. Carefully study the documentation for the complete set.
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Datasheet ----> Breakdown Voltage Vbr=26.7- 29.5V, Clamping Voltage Vc=38.9V at IPPM=15.4A Bordodynov. 10.07.2013, 09:46, "eqmqiq" <g9512728@...>: Thanks for everyone's suggestion, I put a new TVS from the LTspice library(SMBJ24CA) and set a series resistance(0.5 ohm) for the voltage source. |
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Re: A TVS does not work with load dump test??
Thanks for everyone's suggestion, I put a new TVS from the LTspice library(SMBJ24CA) and set a series resistance(0.5 ohm) for the voltage source.
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the simulation result shows the voltage is clamped at 36V, but the breakdown voltage of the TVS is 24V, I don't understand why...? wrong parameter setting?? I update the asc file to TEMP folder with the same file name " TVS_clamp.asc" --- In LTspice@..., Andy <Andrew.Ingraham@...> wrote:
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Re: low noise amplifier
Hi.
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Model: .SUBCKT q2SC5006_v111 7 8 9 Ccb 2 5 58f Cce 2 6 87f Cbe 7 9 0.67f Cb 1 2 180f Ce 2 3 180f Lb 5 7 1.09n Lc 2 8 0.79n Le 6 9 0.99n Lb2 1 5 0.004n Le2 3 6 0.004n Qnpn 2 1 3 q2SC5006_v111_M .MODEL q2SC5006_v111_M NPN +(IS=616e-18 BF=161 NF=0.99 VAF=50.0 + IKF=1.5 BR=14.4 NR=0.99 VAR=2.4 + IKR=0.32 ISE=38.2e-14 NE=2.19 ISC=80e-17 + NC=1.0 RB=4.37 IRB=759e-6 RBM=2.23 + RE=0.4 RC=5.0 CJE=2.21p VJE=0.954 + MJE=0.408 CJC=1p VJC=0.667 MJC=0.408 + XCJC=0.8 + FC=0.50 TF=20.0e-12 XTF=1e-3 VTF=0.668 +ITF=9.7 TR=0 PTF=40 EG=1.11 + XTI=3.0 XTB=0) .ENDS q2SC5006_v111 Bordodynov. 10.07.2013, 08:20, "ferdiancahyodwiputro" <ferdiancahyodwiputro@...>: dear everyone |
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