Design of 3.3 V rail to rail operational amplifier for high resolution ADC driver amplifier

The design and analysis of a two stage high swing operational amplifier commonly known as rail to rail opamp with 3.3V supply voltage used in high resolution ADC driver amplifier is discussed in this paper. The design uses 0.35μm CMOS technology with a differential stage for input and a common source stage (CS) as the second stage with output being single ended. The compensation technique used is Miller compensation which is in the form of a capacitor between the differential and CS stage. The open loop gain of the design is 89.87 dB and the achieved voltage swing is 82.42% of the supply rail.