Analysis and Design of Two-Stage Operational Transconductance Amplifier

9 Abstract—This paper presents design concept of Operational Transconductance Amplifier (OTA). The 0.18μm CMOS process is used for Design and Simulation of this OTA. This OTA having a bias voltage 1.8 with supply voltage, the design and Simulation of this OTA is done using CADENCE Specters environment with UMC 0.18μm technology file. The Simulation results of this OTA shows that the open loop gain of about 71 dB which having GBW of 37 KHz also this OTA is having CMRR of 90 dB and PSRR of 85 dB. This paper presents the design and analysis two-stage operational transconductance amplifier (OTA) for use in switched-capacitor (SC) circuits. The existing design methods for two-stage OTAs often lead to sub optimal solutions because they decouple inter-related metrics like noise and settling performance. In our approach, the cadence tool is used to analysis the transient response, AC response and phase plot of the OTA and settling time has been observed on the simulation. For the optimization routine, there is no need to interface with a circuit simulator because all significant devices parasitic are included in the tool.