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

Liu, Ruifeng; Li, Yongming; Chen, Hongyi

doi:10.1007/s10470-006-5256-8

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2007

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“…In addition, stability problem could exist. In [4], the analog calibration circuit is independent of the baseband IC, whereas it is sensitive to process and temperature variations and aging, and the mismatch effect of charge pump and QPD could cause the mistaken operation.…”

Section: Introductionmentioning

confidence: 99%

Phase self-calibrated scheme for zero-IF receiver

Huang

Wang

2007

Analog Integr Circ Sig Process

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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 ls.

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Section: Introductionmentioning

confidence: 99%