Track-and-hold circuit having pre-charging mosfet capacitor thereof for shortening wake-up delay time

Abstract

A track-and-hold circuit includes a charge pump circuit and a bootstrapped switch. The charge pump circuit pumps a supply voltage into a pumped voltage higher than the supply voltage, including: a MOSFET capacitor, switched based on a clock signal; and a pre-charging circuit for pre-charging a body of the MOSFET capacitor based on a pre-charging signal synchronous with the clock signal, thereby reducing a wake-up delay time of the pumped voltage. The bootstrapped switch tracks and holds an input signal received from one end based on a bootstrapped driving signal, thereby generating a track-and-hold output signal on another end. The bootstrapped driving signal is generated based on a track-and-hold control signal related to the clock signal, the input signal and the pumped voltage provided by the charge pump circuit.