shooterskull
Newbie level 2
How do I measure the transconductance (gm) of the overall circuit? I need to find out how gm varies with common mode input voltage. I have attached a schematic of the circuit that I wish to measure.
From what I know, I am supposed to sweep Vin and find Iout. Then I should use dIout/dVin. However, I am unable to get a gm vs vcm curve that I think is correct. Am I supposed to sweep in AC voltage using the Vcm as a DC biasing point?
I am using Cadence and I am not very familiar with it. So if you guys are able to give me the calculator functions thats even better. Thanks!
From what I know, I am supposed to sweep Vin and find Iout. Then I should use dIout/dVin. However, I am unable to get a gm vs vcm curve that I think is correct. Am I supposed to sweep in AC voltage using the Vcm as a DC biasing point?
I am using Cadence and I am not very familiar with it. So if you guys are able to give me the calculator functions thats even better. Thanks!