Reduction of Phase and Gain Control Dependencies within a 20 GHz Beamforming Receiver IC

This paper studies the phase and gain control dependencies of a variable amplifier (VGA) vector interpolator shifter (VIPS) within 20 GHz beamforming receiver. First, mechanisms variation in classic current-steering VGA are analyzed design techniques proposed such that gain-dependent variations (GDPV) introduced by amplifiers well balanced. Second, similar analysis is performed to evaluate GDPV interpolator, where we show how same only partially apply due cross-coupling structure interpolator’s VGAs. We our receiver IC realized GlobalFoundries 45 nm RFSOI. Very low observed VGA, with less than 0.3-deg. root-mean squared for 9 dB control, whereas VIPS achieves worst-case 14 deg. The full beamformer channel 29 gain, 2.2-2.4 noise figure, -26 dBm input 1 compression consumes 111 mW. Based on these results, improvements validated through simulation. result near-ideal Cartesian has 2-deg. very crosstalk between