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Design >> Analog Design >> common mode input of swit-cap amplifier
https://designers-guide.org/forum/YaBB.pl?num=1169052053

Message started by vhdl00 on Jan 17^th, 2007, 8:40am

Title: common mode input of swit-cap amplifier
Post by vhdl00 on Jan 17^th, 2007, 8:40am

Please see the attached circuit.
I was struglling to set up the common mode input dc level of switcap gain circuit. Most of the cuitcuit analysis just give the ac analysis. I intended to set up the bias through M1 and M3, but it doesn't work. any suggestions?

Thanks

Title: Re: common mode input of swit-cap amplifier
Post by wuyuchun on Jan 18^th, 2007, 9:56pm

I guess the voltage at c,d and the input and output common voltage are not the same as the voltage at a,b.If so,the results are reasonable.