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A Rail-to-Rail Input/Output Constant-g_m CMOS Operational Amplifier

Xue Liu

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Abstract

A CMOS operational amplifier with rail-to-rail input/output ranges and constant-gm is presented.Feedback technique is implemented to control tail current,ensuring self-adjusting gm at a constant value.Class AB output stage is adopted to guarantee full rail-to-rail performance and low quiescent dissipation.At 5 V power supply,the voltage gain of this op-amp is 136 dB(loaded by 1 MΩ resistor shunted with 1 pF capacitor),meanwhile unit gain bandwidth is 9.7 MHz,phase margin is 62.4°.

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What this paper is about

A CMOS operational amplifier with rail-to-rail input/output ranges and constant-gm is presented.Feedback technique is implemented to control tail current,ensuring self-adjusting gm at a constant value.Class AB output stage is adopted to guarantee full rail-to-rail performance and low quiescent dissipation.At 5 V power supply,the voltage gain of this op-amp is 136 dB(loaded by 1 MΩ resistor shunted with 1 pF capacitor),meanwhile unit gain bandwidth is 9.7 MHz,phase margin is 62.4°.

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Available abstract

A CMOS operational amplifier with rail-to-rail input/output ranges and constant-gm is presented.Feedback technique is implemented to control tail current,ensuring self-adjusting gm at a constant value.Class AB output stage is adopted to guarantee full rail-to-rail performance and low quiescent dissipation.At 5 V power supply,the voltage gain of this op-amp is 136 dB(loaded by 1 MΩ resistor shunted with 1 pF capacitor),meanwhile unit gain bandwidth is 9.7 MHz,phase margin is 62.4°.

Key concepts: Operational amplifier, Phase margin, Resistor, CMOS, Electrical engineering, Operational transconductance amplifier, Amplifier, Constant (computer programming)

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