Silicon bipolar 2 V 2 GHz quadrature demodulator without any adjustment

A Si bipolar direct-conversion quadrature demodulator with a flip-flop phase shifter achieves both low amplitude imbalance of ±0.1 dB and a phase error of ±2° over a wide carrier frequency range between 0.1 and 2 GHz, without any adjustment at a low power-supply voltage of 2 V. The double-balanced mixer makes sure that the third-order input-referred intercept point is -3 dBm and the second-order distortion is below the measurement noise level