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Question on large signal gain

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Y

yschuang

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large signal voltage gain

Hello, all

The schematic is a fully differential opamp and an ideal cmfb is used and biased @ half VDD. VDD is 3V.
I was wondering if it is natural or right to test that or any opamp with
a differential voltage which ranges from -1v to 1v because I observed the gain is around 240. The following spice deck is how I test it and check the slope of output voltage. The gain or small signal gain is quite good when the input differential voltage ranges from -20mV to 20mV.
Thanks.

*** deck ***
.dc vid -1 1 0.01
 

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