Charge-pump based switched-capacitor gain stage

Abstract

A low-power switched-capacitor (SC) gain stage based on a capacitive charge-pump (CP) is proposed. It is shown that the CP gain stage achieves the same input-referred thermal noise as a conventional SC gain circuit, while consuming significantly lower power. The effect of parasitic capacitances on the CP gain circuit is discussed. Simulation results confirming the improved power/performance trade-off of the CP gain stage over the conventional approach are provided.