Analysis and design of an auto-IQ phase calibration circuit based on DLL using a quadrature phase detector
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 degrees, exceeding the 1 degrees requirement. The calibration process takes no more than 5 us for an IQ phase error within +/- 3 degrees.
iq phase calibration quadrature phase detector delay-locked loop