A low voltage bootstrapped switch based on zero DC offset input voltage

Abstract

This paper presents an enhancement to the bootstrapped switching circuit by improving the input range limitation for applying direct input with no dc offset voltage. Application of a Darlington pair in the structure of the conventional bootstrap circuit allows for proper operation of circuits requiring low supply voltage and direct high input swing signal with no dc offset voltage. The proposed circuit is simulated using HSPICE and 0.18μm CMOS technology. Total Harmonic Distortion (THD) measurements results in SNR values which meet the necessary performance requirements for low-voltage application of switched capacitor circuits. © IEICE 2008.