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OPAMP input common mode voltage in MOS-C integrator

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neoflash

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In a couse material, I read author stated that MOS-C integrator will suffer from variable input common mode. And it is said that R-C integrator will not.

Could anyone help me explain?

thanks,
Neoflash
 

sunking

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the most fet Rdson depond on the Vds.
 

neoflash

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should not their dc bias be the same, since the other side impedance is infinity?
 

walker8764

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Rdson do depend on Vds :
Ron = L/[µCoxW(Vgs-Vt-Vds)]
but how the variance of Rdson effect the change of common mode voltage?
 

daisyinfall

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The book by P.E.Allen may help,and there is clearly explation in chapter 4.

Regards!
 

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