A simple scheme to extend the linearity of the continuous-time CMFB circuit for fully-differential amplifier

A linear common-mode feedback (ALCMFB) circuit which combines the modified version of the DDA CMFB with source degeneration using MOS transistors is presented. A 1V 50-M sample/s multiply-by-two (X2) circuit with this ALCMFB circuit has been developed to verify our idea. Simulation result using TSMC 0.35 mu m CMOS process shows that this X2 circuit works… CONTINUE READING