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question about "excess phase cancellation" in filt

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mega

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excess phase

This paper provide a simple method to move the zero from right-half plane left-half plane.
I study this paper, and I am trapped on the fig.7 at page 446.
Can anyone tell me why the time constant is
(C1+C2+C1C2/Ci)/gm
95_1158151070.jpg



papger: A 20MHz 6th order BiCMOS parasitic insensitive continuous time filter and second-order equalizer optimized for disk-drive read channels
 

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