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a problem with SNDR of a flip around SHA

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zoe88

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a problem with the dynamic parameters of a flip around SHA

Hi guys!I have designed a flip around SHA for a 10 bit 80 MHz pipelined ADC, yet the fft analysis results are very bad, the peaks of the harmonics are very high and there's too much noise. I wonder if it's because I didn't use bootstrapped switches or it' the problem with my amp or anything else. I have attached some net lists and fft analysis plot(hspice 2010) and a smic0.13 um lib. Please give me any comments that may help. Thanks a lot!
e1.png
View attachment differential-SH_fft.sp.txt
 
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