Analysis and Design of an Auto-IQ Phase Calibration Circuit Based on DLL Using a Quadrature Phase Detector

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This letter presents the analysis and design of an automatic IQ phase calibration circuit based on delay-locked loop (DLL) using a quadrature phase detector. Analysis and design shows that the calibrated quadrature accuracy can reach 0.4°, exceeding the 1° requirement. The calibration process takes no more than 5 us for an IQ phase error within ±3°.

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