Processing circuitry for use with a position sensor
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United States of America Patent
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Apr 29, 2014
Grant Date -
May 12, 2011
app pub date -
Mar 19, 2008
filing date -
Mar 19, 2008
priority date (Note) -
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Abstract
A position encoder is described that generates a signal whose phase varies with a position to be determined. A phase detector determines a first phase measurement of the sensor signal during a first mode and a second phase measurement of said sensor signal during a second mode. The phase detector then differences the first and second phase measurements to obtain a phase difference measurement, which it uses to determine an indication of the position to be sensed. A controller controls a signal generator in order to set a start phase of signals generated in at least one of the first and second modes so that the timings at which said sensor signal crosses a reference level are substantially the same.
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