IEEE Transactions on Very Large Scale Integration (VLSI) Systems · 2019 · 23 citations · 14 references
EngineeringElectrical EngineeringAnalog ElectronicsLow-power DesignMicroelectronicsAnalog Integrated CircuitsAnalog IntegrationCmos Circuit DesignIntegrated Circuit DesignMixed-signal Integrated Circuit DesignSubthreshold Circuit DesignClass Ab AmplifiersCmos Analog Integrated CircuitsGain BandwidthGain-bandwidth ProductMiller EffectSlew RateSmall-signal GainTransconductance
A simple technique to implement highly power efficient class AB-AB Miller op-amps is presented in this paper. It uses a composite input stage with resistive local common mode feedback that provides class AB operation to the input stage and essentially enhances the op-amp's effective transconductance gain, the dc open-loop gain, the gain-bandwidth product, and slew rate with just moderate increase in power dissipation. The experimental results of op-amps in strong inversion and subthreshold fabricated in a 130-nm standard CMOS technology validate the proposed approach. The op-amp has 9 V·pF/μs·μW large-signal figure of merit (FOM) and 17 MHz · pF/μW small-signal FOM with 1.2-V supply voltage. In subthreshold, the op-amp has 10 V · pF/μs · μW large-signal FOM and 92 MHz · pF/μW small-signal FOM with 0.5-V supply voltage.
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