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2018•DEStech Transactions on Computer Science and EngineeringOpen access

A Novel Class AB CMOS Operational Amplifier

Guoliang Fan, Chenghe Wang, Zhengrong He

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Abstract

A novel class AB two stage operational amplifier was presented to deal with the problem of the conventional class A two stage operational amplifier’s limited slew rate. The output stage quiescent current was controlled accurately and the slew rate and unity gain bandwidth were enhanced significantly, along with no additional static power dissipation. Simulation results show that the positive and negative slew rates were raised to 35 and 2.2 times and unity gain bandwidth was raised to 5 times when compared with conventional class A operational amplifier.

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What this paper is about

A novel class AB two stage operational amplifier was presented to deal with the problem of the conventional class A two stage operational amplifier’s limited slew rate. The output stage quiescent current was controlled accurately and the slew rate and unity gain bandwidth were enhanced significantly, along with no additional static power dissipation. Simulation results show that the positive and negative slew rates were raised to 35 and 2.2 times and unity gain bandwidth was raised to 5 times when compared with conventional class A operational amplifier.

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Available abstract

A novel class AB two stage operational amplifier was presented to deal with the problem of the conventional class A two stage operational amplifier’s limited slew rate. The output stage quiescent current was controlled accurately and the slew rate and unity gain bandwidth were enhanced significantly, along with no additional static power dissipation. Simulation results show that the positive and negative slew rates were raised to 35 and 2.2 times and unity gain bandwidth was raised to 5 times when compared with conventional class A operational amplifier.

Key concepts: Slew rate, Operational amplifier, Operational transconductance amplifier, Direct-coupled amplifier, Bandwidth (computing), Fully differential amplifier, Amplifier, Gain–bandwidth product

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