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Simulators >> Circuit Simulators >> How to plot gmn+gmp in cadence using calculator?
https://designers-guide.org/forum/YaBB.pl?num=1336093038

Message started by Larry_80 on May 3^rd, 2012, 5:57pm

Title: How to plot gmn+gmp in cadence using calculator?
Post by Larry_80 on May 3^rd, 2012, 5:57pm

So i am trying to plot gmn (transconductance of NMOS) + gmp (transconductance of PMOS) vs Vin. I was able to save gmn and gmp for eacd DC operating points, then i plot the result of gmn and gmp. But when i try to use the calculator to plot expression (gmn + gmp), the calculator seems unable to evaluate it. I am not sure if i am doing this correctly?

Title: Re: How to plot gmn+gmp in cadence using calculator?
Post by boe on May 4^th, 2012, 4:05am

Larry_80,
Did you use the same values for Vin?
- B O E

Title: Re: How to plot gmn+gmp in cadence using calculator?
Post by raja.cedt on May 4^th, 2012, 5:28am

hello,
sorry to ask you, can you please tell me how to plot gm in cadence (i can chech in the operating point but i would like to plot vs some variable )

Thanks,
raj.

Title: Re: How to plot gmn+gmp in cadence using calculator?
Post by sheldon on May 5^th, 2012, 9:03am

Raja,

Try opening the Results Browser, then selecting dcOpInfo
for the desired device select the dc operating point parameter
you would like and send it to the Calculator. Repeat for the
opposite polarity device.

Example:
Results Browser: dcOpInfo --> NM0 --> gm, see selectgm.tif

Also attached is an example of the plotting the sum of a pch and
nch gm, see plots.tif

Sheldon

Title: Re: How to plot gmn+gmp in cadence using calculator?
Post by sheldon on May 5^th, 2012, 9:06am

Using the Results Browser