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 mu m 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.

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

CAPPUCCINO, Gregorio;COCORULLO, Giuseppe
2008

Abstract

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 mu m 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/143000
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