2009•Unpublished venueRequires access

Desig of High Unity-Gain Bandwidth CMOS Operational Amplifier

Cheng Wang

Abstract

A fully differential operational amplifier with high unity-gain bandwidth was designed and implemented.Structure of folded-cascode operational amplifier,cascode bias circuit and switched-capacitor common-mode feedback(SC CMFB)circuit were discussed in detail.Simulation based on CSMC's 0.5 μm DPTM 5 V mixed-signal process technology showed that the operational amplifier had a DC open-gain of 64 dB and a unity-gain bandwidth of 155 MHz.The operational amplifier was used in an A/D converter for verification,and the specification met the design target.

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Key concepts: Fully differential amplifier, Operational amplifier, Direct-coupled amplifier, Cascode, Open-loop gain, Operational transconductance amplifier, Gain–bandwidth product, Current-feedback operational amplifier