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

Authors:
Ruifeng Liu;Yongming Li;Hongyi Chen
Affiliations:
Institute of Microelectronics, Tsinghua University, Beijing, People's Republic of China 100084;Institute of Microelectronics, Tsinghua University, Beijing, People's Republic of China 100084;Institute of Microelectronics, Tsinghua University, Beijing, People's Republic of China 100084
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2006

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Abstract

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 卤3°.