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A new technique adopting the correlated-double amplification (CDA) to improve the signal swing of the “linear-in-dB”variable gain amplifier (VGA) under a low-voltage supply is presented. This technique significantly reduces the finite op-amp gain requirement without compromising the speed. An efficient 3-stage VGA is introduced for the signal to swing up to 2/3 of the supply voltage by incorporating 2-stage push-pull op-amps. A design in a 0.13µm CMOS process under 1.2V supply is proposed and verified.

Multi-stage variable gain amplifier for low-voltage CCD analog-front end using CDA technique