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Left half plane zero & Right half plane zero

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henrytqy

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The following picture has two circuits that contain the different way of compensation for polos & zeros. As I know that the 1-st(left)one has a zero on the LHP that approximate equals gm/Cc, the 2-nd(right)one has a zero on the RHP that approximate equals gm*rds*gm/Cc. I may ask that which compensition is better?
thands~
zero.JPG
 

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