Does anyone know how to minimize the charge injectioin noise

[extraord]

hi guys,
I've been working on a sc integrator for a 16bit sigma-delta ADC.
while when i doing the bootstrap switches, the charge injection noise
and clock feedthrough give a lot of noise, even the charge injection can be
common mode rejected, there is still body effects (nonlinear) and clock feedthrough.
does anyone who did this before can help me?

 

[manissri]

Re: Does anyone know how to minimize the charge injectioin n

for charge injection problem use botom plate sampling and for clock feedthorugh use differerntial configuration
regrds
manish

 

[sunking]

cmos switch can help too

 

[sdmodulator]

Re: Does anyone know how to minimize the charge injectioin n

maybe this paper is helpful

Circuit Techniques for Reducing the Effects of
Op-Amp Imperfections: Autozeroing, Correlated
Double Sampling, and Chopper Stabilization