Coded data generation or conversion – Converter compensation
Patent
1994-08-24
1997-01-14
DeBoer, Todd
Coded data generation or conversion
Converter compensation
341120, 341140, 324620, 324626, H03M 106
Patent
active
055944396
ABSTRACT:
Abnormal changes in the non-linear characteristics of electronic components are an indication of abnormal conditions such as impending component or system failure. To detect such abnormal changes in nonlinearity, an electronic circuit is subjected to a calibration signal including at least one frequency component. Nonlinearity in the electronic circuit causes distortion components to be generated from the calibration signal. Preferably the nonlinearity is characterized by compensation coefficients that digitally compensate the nonlinearity. The compensation coefficients are adjusted in a feedback loop in response to measured values of the distortion components, so that the distortion components are minimized. At the end of the adjustment process, the transfer function of the electronic circuit is specified by the compensation coefficients, which are stored in memory. The compensation coefficients are compared to respective limits to detect abnormal nonlinearity, and any abnormal nonlinearity is reported to a human operator or to a diagnostic computer. At various times, the measurement process is repeated, and the new values of the compensation coefficients are again compared to their respective limits as well as to their previous values stored in memory. Changes in the compensation coefficients with respect to their previous values are computed and compared to respective "drift" limits, so that abnormal conditions are also detected from abnormal changes in the nonlinearity over intervals of time.
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Crystal Semiconductor Corporation
DeBoer Todd
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