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Efficient switched-capacitor common-mode feedback circuit for high-speed low-power amplifiers

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4 Author(s)
Amoroso, F.A. ; Dept. of Electron., Univ. of Calabria, Rende ; Pugliese, A. ; Cappuccino, G. ; Cocorullo, G.

A new switched-capacitor (SC) common-mode feedback (CMFB) circuit for fully-differential operational amplifiers (op-amps) is presented. By reducing the amplifier capacitive load with respect to conventional SC-CMFB schemes, the proposed solution guarantees a significant improvement of the op-amp speed performance. A typical SC integrator employing the new CMFB has also been designed in 0.35 mum CMOS technology. Simulation results show that, for a given power consumption, the op-amp settling time can be about halved by using the proposed CMFB instead of the conventional one.

Published in:

Electronics Letters  (Volume:44 ,  Issue: 21 )