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Multi-Path Class AB Operational Amplifier with High Performance for SC Circuits

Meysam Akbari

Department of Electrical Engineering, Shahid Beheshti University, G. C., Evin, Tehran, Iran

E-mail Address: Me_akbari@sbu.ac.ir

Corresponding author.

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and

Omid Hashemipour

Department of Electrical Engineering, Shahid Beheshti University, G. C., Evin, Tehran, Iran

E-mail Address: Hashemipour@sbu.ac.ir

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https://doi.org/10.1142/S0218126616501449Cited by:6 (Source: Crossref)

Abstract

In this paper, a single-stage multi-path operational transconductance amplifier (OTA) with fast-settling response for high performance applications is designed. The produced amplifier uses current-shunt technique, double recycling structure, cross-coupled positive feedback configuration and all idle devices in the signal path to enhance transconductance of the conventional folded cascode (FC) amplifier. These transconductance boosting techniques lead to higher DC gain, gain bandwidth (GBW), slew rate and lower settling time compared to the previous FC structures while phase margin is degraded. Simulation results are presented using 90 nm CMOS technology which show 1,800% increment in GBW and a 33.2 dB DC gain improvement in the approximately same power consumption compared to the conventional FC amplifier.

This paper was recommended by Regional Editor Piero Malcovati.

Keywords:

References

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