An Automatic Gain Control Amplifier with Linear-in-dB Gain in 22nm CMOS

This paper proposes an automatic gain control (AGC) amplifier consisting of a linear-in-dB VGA, a peak detector (PD), an error amplifier and a loop filter. The AGC chip is fabricated in a 22nm CMOS technology and consuming power of 13.5 mW under the supply voltage of 1-V. The linear-in-dB VGA realizes the gain adjusting without using extra exponential voltage generating modules, which largely reduces corresponding chip area of this AGC to $0.006 mm^{2}$. The linear-in-dB gain dynamic range is 35 dB and the 3-dB bandwidth is about 1 GHz, satisfying the operating frequency band.