Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- LTspice
- Messages
Search
|
Re: Regarding Monte carlo setup
--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
Hi Helmut and others, Thanks for your answer. I have looked at some of the examples, and I think I now more clearly understand. One thing I though can't figure out is, in the ".step param abc..." there are hereafter three numbers, in this post they are 0 5 1. The zero and five I understand, but the number "1" at the end, what does that stand for? And if I change it to other than "1" what will that cause? Regards Carsten Wind |
|
Re: Inductor initial conditions
Ganesan
Further.Help says:
toggle quoted message
Show quoted text
* L. Inductor Symbol Names: IND, IND2 Syntax: Lxxx n+ n- <inductance> [ic=<value>] + [Rser=<value>] [Rpar=<value>] + [Cpar=<value>] [m=<value>] [temp=<value>] When I invoke the symbol for L there is no place to put IC=Value. Same is true for the Capacitor..... What am I missing? Cheers AG =========================== On 9/23/2011 12:47 PM, Apparajan wrote:
|
|
Inductor initial conditions
Apparajan
Below is a simple netlist.
* C:\Documents and Settings\ganesan\My Documents\Downloads\Draft1.asc R1 out 0 1 L2 out 0 1 .ic I(L2) =1.0 .tran 5 uic .backanno .end I expect the output to be -1v with a time constant of 1 sec. LTspice says otherwise.. What am I doing stupid? cheers AG |
|
Re: How to Specify Polarity on Capacitor Initial Conditions
Ganesan
Help says:
toggle quoted message
Show quoted text
The .ic directive allows initial conditions for transient analysis to be specified. Node voltages and inductor currents may be specified. A DC solution is performed using the initial conditions as constraints. Note that although inductors are normally treated as short circuits in the DC solution in other SPICE programs, if an initial current is specified, they are treated as infinite-impedance current sources in LTspice. Syntax: .ic [V(<n1>)=<voltage>] [I(<inductor>)=<current>] Example: .ic V(in)=2 V(out)=5 V(vc)=1.8 I(L1)=300m I don't see how you specify capacitor voltages.. In the case of Inductor currents, look at the net list and positive current enters through the first node and comes out through the second node cheers AG... ============================================== On 9/23/2011 12:18 PM, michaelstuarts wrote:
|
|
Re: does anyone have TSMC 90nm, 65nm or 45nm node spice model
Allan Wang
They're confidential so I doubt you'll get them.
toggle quoted message
Show quoted text
Cadence offers gpdk090 and gpdk045 which is supposed to be similar to a real process. You can turn the spectre models into a regular spice model readable by LTspice by substituting in variables in model.scs. Allan On Fri, Sep 23, 2011 at 10:16 AM, mshe434 <mshe434@...> wrote:
Hello, |
|
How to Specify Polarity on Capacitor Initial Conditions
Dear Colleagues:
I specified IC = <initial condition> on the capacitor model and this works when you supress DC operating point calculation on the .tran (UIC). I can't tell how LT spice assigns the polarity to the capacitor terminals themselves. Thanks -Michael |
|
Re: Unrecognized Parameters in MOSFET Model
Thanks, Andy and Helmut. I think Helmut is right, since the model has some parameters which don't show up in the PSPICE "all levels" or "level 5" lists. I'll get back to the man'f and report here if I learn anything.
toggle quoted message
Show quoted text
--- In LTspice@..., Andy <Andrew.Ingraham@...> wrote:
Sorry, forgot to mention that this is a PSPICE model.Possibly not. There is no central clearinghouse for MOSFET model |
|
Re: does anyone have TSMC 90nm, 65nm or 45nm node spice model
Ganesan
Has ome of what you request.... ON Semi 0.50 micron (C5) ON Semi 1.50 micron (ABN) [inactive] IBM 0.50 micron (5HP, 5AM, 5DM, 5PA) IBM 0.35 micron (5HPE, 5PAe) IBM 0.25 micron (6HP, 6DM, 6RF) IBM 0.18 micron (7RF, 7RFSOI, 7WL, 7SF, 7HP) IBM 0.13 micron (8RF-LM, 8RF-DM, 8HP, 8WL) IBM 90 nanometer (9SF, 9LP, 9RF) IBM 65 nanometer (10SF, 10LPe/10RFe) IBM 45 nanometer (12SOI) IBM 32 nanometer (32SOI) TSMC 0.18 micron TSMC 0.25 micron TSMC 0.35 micron Cheers AG On 9/23/2011 11:09 AM, Swapnil Christian wrote:
|
|
Re: Unrecognized Parameters in MOSFET Model
Sorry, forgot to mention that this is a PSPICE model.Possibly not. There is no central clearinghouse for MOSFET model LEVELs. Usually the first few (1-3?) are the same everywhere, since that's what came with Berkeley SPICE2, but above that they might not be. LTspice's LEVEL=5 is a BSIM2 model, so unless you know it is supposed to be BSIM2, don't use LEVEL=5. Andy |
|
Re: Unrecognized Parameters in MOSFET Model
--- In LTspice@..., "itisa3l" <gerrit@...> wrote:
Hello, Level 5 in PSPICE is different from Level 3. On the other hand, many parameters don't fit the level=5 of Pspice except Tcv. Tcv is the temperature coefficient of the threshold voltage in level 5. I guess the level=5 is a typo in the model. This means you can change the level to 3 and remove the parameter Tcv. I plotted Id(Vgs) with level=3 and the current versus Vgs has looked very similar as shown in the datasheet. Best regards, Helmut .SUBCKT AO4420A 4 1 2 M1 3 5 7 7 NM W=3147763u L=1.07u M2 7 5 7 4 PM W=2500000u L=0.4u RG 6 5 0.4 LG 1 6 3n LS 2 7 1.5n R1 4 3 RTEMP 6.7450506E-3 CGS 5 2 0.085E-10 DBD 7 3 DBD *DSky 7 3 D1; Sky Diode ** .MODEL D1 D(CJO=2E-10 VJ=0.33 TRS1=0.05 TRS2=0.05 M=0.5 xti=8 +RS=600E-4 FC=0.5 IS=1.5E-6 TT=5E-9 N=1.0 BV=30 IBV=250E-8) ** .MODEL NM NMOS (LEVEL = 3 TOX = 2.5E-8 + RS = 3E-4 RD = 0 VTO=1.9 kp=10e-5 + UO = 274.3 THETA = 0.4 NSUB=2e17 + VMAX = 8E6 XJ = 5.1E-7 KAPPA = 1.1 + ETA = 0 TPG = 1 + IS = 0 LD = 0 + CGSO = 0 CGDO = 0 CGBO = 0 + NFS = 2E10 DELTA = 0.1) *+ TCV=2e-3 ; removed * .MODEL PM PMOS (LEVEL = 3 TOX = 2.5E-8 + NSUB = 5e16 TPG = -1) * .MODEL DBD D (CJO=4.2E-10 VJ=0.55 M=0.497 xti=20 TRS1=0.01 TRS2=0.01 + RS=0.73E-3 FC=0.5 IS=6E-14 TT=15E-9 N=1.0 BV=30 IBV=250E-6) ** .MODEL RTEMP RES (TC1=4E-3 TC2=3.2E-6) ** .ENDS |
|
Re: does anyone have TSMC 90nm, 65nm or 45nm node spice model
Swapnil Christian
Hey Min,
toggle quoted message
Show quoted text
Hope this helps, although they are not TSMC models. May be you can use the Predictive Technology Models available @ --- In LTspice@..., "mshe434" <mshe434@...> wrote:
|
|
Re: Unrecognized Parameters in MOSFET Model
Thanks, Bordodynov. When I change to level 3 I still get one unrecognized parameter Tcv. Also, the LTspice Help shows seven different levels for MOSFETs including level 5. I hope the man'f knows what they're doing when they spec level 5, but maybe I'm being too charitable...
toggle quoted message
Show quoted text
--- In LTspice@..., ?????????¡Á ¨¢???????? <bordodunovalex@...> wrote:
|
|
Re: Using Encrypted Library Files
--- In LTspice@..., "Tim" <timstansifer@...> wrote:
Hello Tim, LTspice can only use files which were encrypted with LTspice. Hspice can only use files which were encrypted with Hspice. Pspice can only use files which were encrypted with Pspice. ... For which SPICE were your files encrypted? Best regards, Helmut |
|
Using Encrypted Library Files
I have been trying to use an encrypted library file but LT Spice is not reading it correctly. The help files claim that it can be done so maybe I am just missing something.
I have brought it into LT Spice like any other 3rd party model. Is there another step required to make this model readable? |
|
Re: IRL630 Model Request
Thank you for your help and advice, Tony, but in defense of my competence as a user of the internet, I tried all that and there are no SPICE models on any of those pages specifically for the IRL630 (unless I'm missing something obvious, in which case I humbly submit myself to you). I even emailed Vishay, who responded today that they do not have a SPICE model for that part. Of course, all this just means I have to learn how to write code! Something I was hoping to avoid, but a useful skill none the less. Thanks everyone for your help.
toggle quoted message
Show quoted text
--- In LTspice@..., "Tony Casey" <tony@...> wrote:
|
|
Re: IRL630 Model Request
Thanks! Now I just have to learn how to compile and implement this code in LTSpice... a topic for a different thread.
toggle quoted message
Show quoted text
--- In LTspice@..., ?????????¡Á ¨¢???????? <bordodunovalex@...> wrote:
|
|
Identify Plots From Swept Parameter Output
I have built a circuit where I sweep three parameters, let's say R1, R2, and R3. When I run that I get 27 plots of course, and I can use Select Steps to see which values correspond to which plots, which is great. But what I really need to do is pick out the top and bottom plot in the series of 27. I didn't find an answer in my searched in this forum, so I thought I would write.
The short question is: If I have multiple plots in the plotting window from a set of ".step param X List 1 2 3" commands, how can I identify what param values are associated with each plot? Thanks very much. |
|
Re: building subcircuit graphically?
you can normally copy and paste textThat works for the .MODEL statements that you can paste into your schematic. But you will still need to draw the entire schematic yourself. You might be able to copy portions of the schematic from the PDF, as graphics, but it would be non-functional. Just a picture to help document your schematic. Andy |
to navigate to use esc to dismiss