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Problems about fully differential filter,please help~~

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superleaf

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I have designed a fully differential opamp,the parameter of the opamp as follows:gain=73dB,bandwidth=47kHZ,unit gain bandwidth=236MHZ,phase margin=42 deg,the opamp has CMFB,when using the opamp to construct a low-pass fiter,the insertion lose is about -78dB,and -3dB bandwidth of the filter is not the required,i don't know what the problem is,plz everyone can give me some opinions~~
 

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