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Gain variation over ICMR

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predator89

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I have designed a two stage opamp. As i needed to check the ICMR, I did DC analysis to see over what voltage range my transistors are in saturation. And then I performed AC analysis by doing parametric sweep of common mode input over that range.

I found 4 dB variation of gain over ICMR range. Is this correct method to check ICMR and is 4 dB variation acceptable.
 

Gain always varies over the ICMR range, s. here:
gain _vs_ICMR.png
How much variation you find acceptable depends on your application. Usually -3dB , sometimes an Input -1 dB Compression Voltage Range is required.
 

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