| Author |
Message |
drabos
Joined: 03 Jan 2006
Posts: 425
Helped: 26
|
 04 Jul 2008 13:11 Re: How to do this in IC5? |
|
|
|
| oermens wrote: |
| run sp in spectre, after simulation results->direct plot->main form and you can get gm |
Do you mean make an S-parameter simulation?
|
|
| Back to top |
|
 |
drabos
Joined: 03 Jan 2006
Posts: 425
Helped: 26
|
| 04 Jul 2008 23:34 Re: How to do this in IC5? |
|
|
|
| drabos wrote: |
| v_naren wrote: |
Mon May 24, 2004.
Warning from spectre during initial setup.
`NM1': Does not have a terminal named `gm'.
Ignoring invalid item `NM1:gm' in save statement.
`NM1': Does not have a terminal named `oppoint'.
Ignoring invalid item `NM1:oppoint' in save statement.
|
I have the same problem, with this save MN1:oppoint method.
Do you have any idea, what can be the problem?
Thanks, |
Problem is solved 
|
|
| Back to top |
|
|
edge_tv
Joined: 29 Apr 2008
Posts: 23
Helped: 4
|
| 08 Jul 2008 5:23 How to do this in IC5? |
|
|
|
| OK her is may way, you can plot all small signal paramters like gm,gds, cgs, vth and so on. I use ocean for this task. Set a test bench up with one singl Transistor, sweep vgs and set a fix vds. Save the Drain current (select in analogartis save from schematic),this wil give you the right name of the Transistor. Make sure that you on the lowest level, for example if you are on the top of you design the Transistor is calld MN01, but if you go one level down it is called MN01/MN9999 (for example). So here is the trick if you use MN01 as name no gm, but you can still get the Drain current. If you use MN01/MN9999 you get everything you want. You have to figuer out how your Transistor is really called, you should also look at the netlist. When you have save the current, save an ocean skript and change MN01/MN9999.ids into MN01/MN9999.gm and run that skript, I usaly stor the result into a txt fiel and bring it to matlab.
|
|
| Back to top |
|
|
needforspeed
Joined: 21 Dec 2005
Posts: 20
Helped: 1
Location: FRANCE
|
| 08 Jul 2008 13:09 Re: How to do this in IC5? |
|
|
|
| sutapanaki wrote: |
| Can someone please explain how to plot transistor intrinsic parameters (like gm, gds, Csb,...) using Cadence Spectre? I assume that since the tool calculates these things for the operating point it should also be able to plot them as a function of time or temperature or something else. |
it's very easy to do that. do DC analysis, then you can find the parameters you interested in the results browser and plot what you want.
|
|
| Back to top |
|
|
