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A 1.5-V high drive capability CMOS op-amp

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3 Author(s)
Palmisano, G. ; Dipt. Elettrico e Sistemistico, Catania Univ., Italy ; Palumbo, G. ; Salerno, R.

A novel CMOS operational amplifier with a 1.5 V power supply is presented. It is based on a folded-mirror transconductance amplifier and a high-efficiency output stage. The amplifier achieves an open-loop gain and a gain-bandwidth product higher than 65 dB and 1 MHz, respectively. In addition, a 1 V peak-to-peak output voltage into a 500 Ω and 50 pF output load is provided with a total harmonic distortion of -77 dB. This performance was achieved using maximum aspect ratios of 120/1.2 and 360/1.2 for the NMOS and PMOS transistors, respectively, and a quiescent current as low as 60 μA for the driver transistors. The amplifier was implemented in a standard 1.2 μm CMOS process with threshold voltages around 0.8 V. It dissipates less than 300 μW

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:34 ,  Issue: 2 )