Pseudo-Three-Stage Miller Op-Amp With Enhanced Small-Signal and Large-Signal Performance
- 14 June 2019
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Very Large Scale Integration (VLSI) Systems
- Vol. 27 (10), 2246-2259
- https://doi.org/10.1109/tvlsi.2019.2918235
Abstract
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.Keywords
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