fully differential opamp simulation help needed

[jimito13]

Hi,

I want to simulate the output swing and the IIP3 for a fully differential opamp.How should i set up the connections and the testbenches?I would appreciate any help.Thx in advance.

 

[sumanmicro]

Hi,

what tool are you using .
Like I did it using cadence spectre,its simple

 

[jimito13]

I use cadence spectre.

 

[sumanmicro]

then for a two stage diffamp
give on one of the inverting/non-inverting input a dc voltage of 2V with a phase of 0
and on the other hand ,give an input of 0V with 180 phase


then plot the DC response along with the ac response of output with respect to input (2V) .

for input sources use VDC

 

[jimito13]

sumanmicro thanks for your answer but i must admit that i didn't understand anything...could you please be more accurate to what you say and show me a testbench with a schematic?