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I have a question to get a formula from Razavi's book.

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twonsr

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Hi All :
In page 426, Fig. 12.32c ,
it says that CxVx - (Vout - Vx)Ch = 0

how to derive and get this formula ?
Thanks
 

toltal charge at x equal zero.
charge at vcap. Cx +charge at cap. CH = 0
given Q=C*V>> Cx*Vx+ (Vx-Vout)*CH=0
 

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