System and method for dynamic calibration of a quadrature...

Details System and method for dynamic calibration of a quadrature... System and method for dynamic calibration of a quadrature...

2007-07-30

2010-12-14

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S296000, C375S299000, C375S346000

Reexamination Certificate

active

07852969

ABSTRACT:
A system and method for real time calibration of a quadrature encoder. Errors from sources such as signal offsets, amplitude mismatches and phase errors are addressed. In one embodiment, the errors are addressed by determining and applying a dynamic operational set of calibration parameters. The process for determining the operational calibration parameters involves minimizing a variation metric that indicates the variations of the magnitudes of a set of corrected vectors Ci″. The corrected vectors Ci″ are defined by using the calibration parameters to provide corrected vector components (Ati″, Bti″) that correspond to a current operational set of quadrature signal samples comprising at least four respective quadrature signal samples (Ati, Bti) having spatial phase angles θti that are distributed over a significant portion of 360 degrees. For well chosen calibration parameters, the resulting corrected vectors define a well-centered circle and the variation metric is minimized.

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