A Radio Frequency Wideband Variable Gain Amplifier Design Based on 40nm CMOS Technology

In this paper, a wideband variable gain amplifier based on 40nm CMOS technology is presented. The VGA consists of two cascaded cascode amplifiers. The common gate transistors are used as switches to control the current injected into the resonator load in order to control voltage gain. A switched capacitor array is implemented in the resonator to control center frequency. The VGA has a frequency range of 13.5 GHz to 18 GHz and achieves a 1 dB bandwidth of 2 GHz. The gain tuning range is -14 dB to 11 dB and -6 dB to 19 dB at low and high band, respectively, with a gain resolution of 1.5 dB. The input 1 dB compression point is about -16 dBm.