Importance

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Abstract

A method and apparatus for offset detection and correction is disclosed. In an active amplifier or filter system, or any system that may suffer from unwanted offset, the invention monitors for periods when an input, i.e. reference value, may be predicted or is known. When such a period is detected, the offset detection and correction system records the offset and compares it to the known or predicted reference value. Based on the comparison the amount of offset can be determined. In one configuration, the offset is determined to be greater than or less than the reference value. A digital value is thus provided to correction logic to control an output value. This output value increments or decrements a counter. The output of the counter feeds into a digital to analog converter. The output of the digital to analog converter is provided by into the system that suffers from offset to correct or counter the unwanted offset. Control logic, comparators, pattern detection systems, counters and digital to analog converters may be used to implement the invention.

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First Claim