In analog electronics, Clock feedthrough is the result of the coupling between control signals on the analog switch and analog signal passing through the switch. In digital electronics, clock feedthrough is the coupling of the clock signal to the nodes where coupling is not intended. Such coupling happens because of the gate-to-source capacitance, interconnects parasitic capacitance or because of the substrate coupling. Clock feedthrough is generally considered harmful. Methods to reduce clock feedthrough include:
References
Clock feedthrough in CMOS analog transmission gate switches
Clock feedthrough example in digital circuits
Clock feedthrough compensation with phase slope control in SC circuits
Clock feedthrough cancellation with compensation for the current-switched systems