plot the curve of Cgs vs Vgs in Cadence

[anhnha]

Hi.

I want to check if the gate-source capacitance Cgs depends on bias voltage Vgs or not. I set up the circuit for simulation in Cadence as below.
Could you tell me how can I plot the curve of Cgs vs Vgs.
Thanks.

 

[natnoraa]

Hi,

Follow the steps listed here :http://www.32mosfets.com/cadence/cadence-tutorials/plot-gm-and-gmid/

Everything until step 6 will be similar. Then choose Cgs and if you sweep VGS, you'll have your plot. Credits go to the writer.

Natnoraa

 

[anhnha]

Hi, thanks. I followed that procedure. However, in the step 3. I don't see there is such options.
3. now click ADE -> options -> select waveform tools : AWD

 

[natnoraa]

Hi,

try this: in your ADE window, select setup and then model libraries. attach the .scs file from there (for that step)

Natnoraa

 

[anhnha]

Hi.
I completed step 5 and got the Results Browser as bellow.
However, I don't understand step 6. It says something like this "Right click Cgs and get the Cgs plot".
Where is Cgs to click on?
Please tell me how to proceed? Thanks.

 

[natnoraa]

Hi,

Sorry for the late reply. Is it in dcOp-dc or dcOpinfo-info? Find the transistor and you can plot all the dc related parameters

Natnoraa

 

[anhnha]

Thank you.
I used DC analysis and it is in dc-dc. Now I can plot a lot of internal parameters that I always got stuck.

 

[natnoraa]

Hi,

Don't mention it. I had the same problem when i first started out. Glad I could be of some help.

Natnoraa