Abstract
AbstractThis article presents 5–6 GHz beamforming receiver with Q‐factor calibrated vector modulator to reduce phase error and amplitude mismatch. Q‐factor of vector modulator IQ network has to be 0.95–1.05 in 5–6 GHz to get under ±3° phase error. Proposed Q‐factor calibration circuit selects the best capacitance and resistance for proper Q‐factor in desired frequency range. Beamforming receiver prototype, which is implemented in 0.13‐μm CMOS, has 0.98–1.03 Q‐factor in 5–6 GHz. The prototype has improved performance than without calibration: its rms phase error is maximum 1.5° (4.5° improved), and amplitude mismatch is maximum 0.47 dB (0.73‐dB improved). In addition, noise figure is 3.8–4.6 dB at 5–6 GHz.
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