Phase self-calibrated scheme for zero-IF receiver

Authors:
Shuilong Huang;Zhihua Wang
Affiliations:
Department of Electronics Engineering, Tsinghua University, Beijing, P.R. China 100084;Department of Electronics Engineering, Tsinghua University, Beijing, P.R. China 100084
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2007

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

Analog Integrated Circuits and Signal Processing

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Abstract

A new phase self-calibrated scheme maintains the quadrature is proposed in the letter, which mainly includes quadrature phase detector (QPD), charge pump, comparator, controller and variable delay buffer (VDB) etc. The primary idea behind the scheme is that the quadrature phase error is converted to the voltage variation on the capacitor, and then the voltage variation drives the controller to tune the VDB to the proper control word. The phase calibration is digitally controlled and considers the mismatch effect of charge pump, removing the disadvantage of conventional analog calibration circuit whose performance is sensitive to process and temperature variations and aging. It is shown that the two VDBs have an 8°quadrature phase shift tuning range, and an 8 mA current at 1.7 HGz, and the calibration process takes less than 160 μs.