Paper Title
Variation in Parameters of CMOS Op-Amp Designed using GPDK 180nm and GPDK 90nm Technology

In this paper behavior of multiple energy storage elements of Op-amp is observed. Initially a two stage Op-amp is designed using CMOS technology in VLSI. Designed Op-amp consist of differential amplifier & gain amplifier. The initial stage of differential amplifier removes the noise and only amplifies the actual signal. Since the amplified signal does not meet Op-amp requirements a gain amplifier is used for amplification. 2nd stage is a common source amplifier which is used to increase the gain. Keywords- Cadence gpdk090, gpdk180, Differential Amplifier, Common Source amplifier, current Mirror circuit.