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Linear-in-dB Variable Gain Amplifier with PWL exponential gain control

A Variable Gain Amplifier (VGA) based on the Gilbert Cell is presented in this paper. A Piecewise-Linear (PWL) circuit is employed to obtain a gain variation linear in dB. The PWL block is based on multiple cascaded simple current mirrors. The VGA was designed in a 0.35nm CMOS process with 3 V supply. The circuit presents 1.7V output swing, 33 dB gain variation (from 2.7 to 35.6 dB) and a bandwidth of 800 KHz.