2011•Unpublished venueRequires access

Design of a High Performance Fully Differential Operational Amplifier

Zhai Jianghui

Abstract

In order to obtain higher gain and better stability,a high-performance two-stage fully differential operational amplifier was designed based on 0.18 μm CMOS process,using a two-stage amplifier structure and two common mode feedback loops.Simulation results showed that,when operating at 1.8 V supply power and 5 pF capacitive load,the proposed operational amplifier had a DC gain of 97.12 dB,a unity gain bandwidth of 756 MHz,a common mode rejection ratio of 323.24 dB,and a phase margin of 46 °.The op amp is applicable for low voltage circuits and high resolution A/D converter.

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Available abstract

Key concepts: Fully differential amplifier, Phase margin, Operational amplifier, Open-loop gain, Direct-coupled amplifier, Operational transconductance amplifier, Gain–bandwidth product, Operational amplifier applications