A low-voltage, high-gain CMOS operational amplifier for switched-capacitor application in a digital 90nm CMOS process

This paper discusses the design of low-voltage, high gain, fully differential CMOS Op-amp in a low voltage (V
_DD
= 1.0V) 90nm CMOS process. This Op-amp is ideally suited for switch-capacitor circuits and simulations show a unity gain bandwidth of 651MHz with 1pF load capacitor and a DC gain of more than 107dB. The phase margin is around 58°. The circuit topology is a two-stage folded cascode structure with regulated cascodes for gain boosting.