Abstract
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.
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