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A continuous-time common-mode feedback circuit (CMFB) for high-impedance current-mode applications

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3 Author(s)
L. Lah ; Univ. of Southern California, Los Angeles, CA, USA ; J. Choma ; J. Draper

A continuous-time common-mode feedback circuit (CMFB) is presented. A two-stage high-gain architecture is used to stabilize and minimize the offset of the common-mode voltage. A long-channel differential-difference amplifier (DDA) input stage enables this CMFB circuit to have a wide input voltage range without a serious linearity problem. A special compensation scheme enables this circuit to be used in high-impedance current-mode systems without a stability problem. This circuit has been implemented within a continuous-time switched-current ΣΔ modulator in a 2 μm CMOS process. It achieves a ±1 V input voltage range with an active area of 100 μm×60 μm and a power dissipation of 270 μW from a single 5 V power supply

Published in:

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing  (Volume:47 ,  Issue: 4 )