Answer / lu

Charge sharing is an undesirable signal integrity phenomenon
observed most commonly in the domino logic family of digital
circuits. The charge sharing problem occurs when the charge
which is stored at the output node in the phase is shared
among the output or junction capacitance of transistors
which are in the evaluation phase. Charge sharing may
degrade the output voltage level or even cause erroneous
output value

Answer / gk

it is like suppose you have two capacitors connected in series/parallel there will be charge sharing. in mosfet we want the gate capacitance to control channel only.but gate to drain overlapping(coupling) at the end of channel creates capacitance(Cgd) similarly at source also. there is PN junction depletion capacitance at drain/source with substrate completes path. This path creates coupling of input to drain.

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