Re: plot gain of an amplifier versus a bias voltage in hspice
Hi dear,
Firstly, as you mentioned in your request, you use differential amplifire so when you are simulating, you should apply common mode and differential voltage. common mode voltages should be same, however differential voltages must have 180 degree difference in phase. you should consider frequency response of your circuit to select optimal frequency.
secondly, I think It's not possible to have both DC and AC sweet at the same time,i.e you can't sweep DC voltage in order to investigate AC gain.I wonder!!!
Kindly regards,
Ebi:wink: