COMPARISON OF SINGLE STAGE AND TWO STAGE CMOS OPERATIONAL AMPLIFIERS

Abstract

Operational amplifier (Op-amp) is versatile device that can be used to amplify DC as well as AC input signals. In this project work a two stage CMOS op amp and single stage CMOS op amp has been compared based on values of their performance parameters by using 0.35μm CMOS technology and the same power supply (3.5V). As the result shows that: single stage CMOS op amp has larger phase margin and smaller power dissipation than two stage CMOS op amp. This shows that single stage CMOS op amp is more stable and operates longer duration of time than two stage CMOS op amp with small energy loss. Whereas two stage op amps produces the output which is almost twice larger than single stage op amp. In addition the noise in the output of two stage op amp is less than single stage op amp. So to obtain high output it is better to use two stage op amps than single stage op amp. By results and reasons suitable choices of CMOS op amp will be done based on their performance parameters.