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INL & Gain of sigma-delta modulator

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you23

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I am testng sigma-delta modulator (SC) that I designed.

*2nd order - 1bit output(SC)
*fully-differential input
*fclk=500k
*gain=1
*VDD=3V, Vcommon=1.5V

in these case ,
1) Vinp=Vcommon, Vinm=0to3V swep ---> gain=almost 0, INL=4LSB
2) Vinm=0to3V, Vinm=Vcommon swep ---> gain=lower than 0


linerlity is different,
please tell me which point shold I check in circuit.
 

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