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2014•Unpublished venueRequires access

A newrail-to-rail opamp with bulk-driven input stage and interleaved class-AB ouput stage

Jianping Ma, Yuan Chen, Tian Tong

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Abstract

This paper introduces a fully differential rail-to-rail input/output CMOS operational amplifier consisting of a bulk-driven input stage and an interleaved class-AB output stage. The input stage features a partial positive feedback loop to improve the gain and gain-bandwidth-product. Post-layout simulated results have shown that the proposed opamp, implemented in standard 65nm CMOS technology and with a 1.2V supply, obtains an open-loop DC gain higher than 72dB and gain-bandwidth-product above 15MHz when a 6pF load is connected to the differential output.

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What this paper is about

This paper introduces a fully differential rail-to-rail input/output CMOS operational amplifier consisting of a bulk-driven input stage and an interleaved class-AB output stage. The input stage features a partial positive feedback loop to improve the gain and gain-bandwidth-product. Post-layout simulated results have shown that the proposed opamp, implemented in standard 65nm CMOS technology and with a 1.2V supply, obtains an open-loop DC gain higher than 72dB and gain-bandwidth-product above 15MHz when a 6pF load is connected to the differential output.

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Available abstract

This paper introduces a fully differential rail-to-rail input/output CMOS operational amplifier consisting of a bulk-driven input stage and an interleaved class-AB output stage. The input stage features a partial positive feedback loop to improve the gain and gain-bandwidth-product. Post-layout simulated results have shown that the proposed opamp, implemented in standard 65nm CMOS technology and with a 1.2V supply, obtains an open-loop DC gain higher than 72dB and gain-bandwidth-product above 15MHz when a 6pF load is connected to the differential output.

Key concepts: Gain–bandwidth product, Operational amplifier, CMOS, Open-loop gain, Fully differential amplifier, Bandwidth (computing), Electronic engineering, Computer science

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