lhlbluesky
Banned
two stage opamp compensation
i want to design a two-stage opamp with cascode compensation ,and the first stage is folded cascode structure, the requirements as follows:
resolution:11 bit
clock speed: 20M
CL=2pF,Cs=Cf=1pF,DR=70dB,Vdd=3.3V,output swing= +/-1V
then how to design the two-stage opamp step by step? how to choose the size of compensation capacitor? and should I use one or two compensation capacitor , and what's the difference? how to decide the tail current of the two stages? finally, how to decide the size of each transisitor? and what's the relationship of every parameters, such as SR\ Wu\ Cc\ Gm,in\ fFB\ Iss etc. pls help me.thanks. some relative advice or papers are expected, thanks all again.
i want to design a two-stage opamp with cascode compensation ,and the first stage is folded cascode structure, the requirements as follows:
resolution:11 bit
clock speed: 20M
CL=2pF,Cs=Cf=1pF,DR=70dB,Vdd=3.3V,output swing= +/-1V
then how to design the two-stage opamp step by step? how to choose the size of compensation capacitor? and should I use one or two compensation capacitor , and what's the difference? how to decide the tail current of the two stages? finally, how to decide the size of each transisitor? and what's the relationship of every parameters, such as SR\ Wu\ Cc\ Gm,in\ fFB\ Iss etc. pls help me.thanks. some relative advice or papers are expected, thanks all again.