Coded data generation or conversion – Converter calibration or testing
Reexamination Certificate
2007-08-15
2008-12-02
Nguyen, Linh V (Department: 2819)
Coded data generation or conversion
Converter calibration or testing
Reexamination Certificate
active
07460045
ABSTRACT:
A method and apparatus are provided for calibrating a multi-stage A/D converter, such as a pipelined A/D converter. The method and apparatus are based on estimating the bounds of histograms of codes from various stages in the A/D converter. Known approaches were effective in calibrating A/D converters but during bound estimation suffered from lock-up conditions from which it could not recover. Embodiments of the present invention describe two mechanisms for recovering from lock-up conditions and a mechanism for fast locking. If neither a gross lock-up condition nor a fine lock-up condition is detected, the estimated bound is modified based on a comparison of a current digital residue with a fast lock value and a bound window. A discontinuity in the transfer characteristic of the A/D converter can then be removed based on the estimated bound.
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Behmann Curtis B.
Borden Ladner Gervais LLP
Nguyen Linh V
PMC-Sierra Inc.
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