Clock feedthrough in CMOS analog transmission gate switches

An analysis of clock feedthrough in CMOS analog transmission gate (TG) switches is presented in this paper. The mechanism for clock feedthrough and a related model of a transmission gate switch are established in the current-voltage domain. Coupling from overlap and MOSFET gate capacitors causes clock feedthrough in TG switches. The slower gate voltage transition provides additional time for the MOSFET to compensate the coupling error on the sample and hold (S/H) capacitor, yielding a smaller clock feedthrough error.