A 0.6 V class-AB rail-to-rail CMOS OTA exploiting threshold lowering

A 0.6 V class-AB rail-to-rail CMOS OTA exploiting threshold lowering

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A class-AB OTA (operational transconductance amplifier) topology with rail-to-rail input common-mode range is proposed for application in very low-voltage applications. High efficiency is achieved by reusing transistors both for class-AB operation and for mirroring the output currents, and a threshold lowering technique is applied to allow supply voltages less than two threshold voltages. Simulations in 40 nm CMOS technology show 41 dB gain at ±0.3 V supply voltage, a unity-gain frequency of 8.8 MHz on a 5 pF load, class-AB behaviour and full rail-to-rail operation when closed in unity-gain buffer configuration.


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      • 2. Centurelli, F., Monsurrò, P., Scotti, G., et al: ‘A very low-voltage differential amplifier for opamp design’. European Conf. Circuit Theory Design, Linkoping, Sweden, August 2011, pp. 769772, doi: 10.1109/ECCTD.2011.6043846.
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