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A high-swing CMOS telescopic operational amplifier

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2 Author(s)
K. Gulati ; Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA ; Hae-Seung Lee

A high-swing, high-performance CMOS telescopic operational amplifier is described. The high swing of the op-amp is achieved by employing the tail and current source transistors in the deep linear region. The resulting degradation in differential gain, common-mode rejection ratio (CMRR), and other amplifier characteristics are compensated by applying regulated-cascode differential gain enhancement and a replica-tail feedback technique. A prototype of the op-amp has been built in a 0.81-μm CMOS process. Operating from a power supply of 3.3 V, it achieves a differential swing of ±2.15 V, a differential gain of 90 dB, unity-gain frequency of 90 MHz, and >50-dB CMRR. It is shown, analytically and through simulations, that the operational amplifier maintains its high CMRR even at high frequencies

Published in:

IEEE Journal of Solid-State Circuits  (Volume:33 ,  Issue: 12 )