Feedthrough reduction technique for track-and-hold circuit with body-bias control circuit

Abstract

This paper describes a feedthrough reduction technique for a track-and-hold (T/H) circuit with a body-bias control circuit. We propose a T/H circuit with a feedthrough canceller. This circuit cancels a leaking signal to the output node through the parasitic capacitance by using an opposite-phase signal. The simulation results using 90-nm CMOS technology demonstrate a feedthrough of -89.4dB and SFDR of 66dB at a sampling frequency of 5GHz.