Signal conditioning for an optical encoder
First Claim
1. An encoder with signal conditioning of an emitter drive signal, the encoder comprising:
- a peak comparator to output a peak comparator signal based on a comparison of an input sinusoidal signal stored at a first time with the input sinusoidal signal stored at a second time;
a pulse generator coupled to the peak comparator, the pulse generator to determine a peak of the input sinusoidal signal based on the peak comparator signal;
a threshold comparator coupled to the pulse generator, the threshold comparator to compare a differential signal amplitude with a differential signal amplitude window at approximately the peak of the input sinusoidal signal, wherein the differential signal amplitude is associated with the input sinusoidal signal; and
digital circuitry coupled to the threshold comparator, the digital circuitry to generate an emitter modification signal in response to a determination that the differential signal amplitude is outside of the differential signal amplitude window.
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Abstract
An encoder with signal conditioning of an emitter drive signal is described. In one embodiment, the encoder includes a peak comparator, a pulse generator, a threshold comparator, and digital circuitry. The peak comparator outputs a peak comparator signal based on a comparison of an input sinusoidal signal stored at a first time with the input sinusoidal signal stored at a second time. The pulse generator determines a peak of the input sinusoidal signal based on the peak comparator signal. The threshold comparator compares a differential signal amplitude with a differential signal amplitude window at approximately the peak of the input sinusoidal signal. The differential signal amplitude is associated with the input sinusoidal signal. The digital circuitry generates an emitter modification signal in response to a determination that the differential signal amplitude is outside of the differential signal amplitude window.
14 Citations
20 Claims
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1. An encoder with signal conditioning of an emitter drive signal, the encoder comprising:
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a peak comparator to output a peak comparator signal based on a comparison of an input sinusoidal signal stored at a first time with the input sinusoidal signal stored at a second time; a pulse generator coupled to the peak comparator, the pulse generator to determine a peak of the input sinusoidal signal based on the peak comparator signal; a threshold comparator coupled to the pulse generator, the threshold comparator to compare a differential signal amplitude with a differential signal amplitude window at approximately the peak of the input sinusoidal signal, wherein the differential signal amplitude is associated with the input sinusoidal signal; and digital circuitry coupled to the threshold comparator, the digital circuitry to generate an emitter modification signal in response to a determination that the differential signal amplitude is outside of the differential signal amplitude window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for conditioning an emitter drive signal of an optical encoder, the method comprising:
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comparing an input sinusoidal signal stored at a first time with the input sinusoidal signal stored at a second time to determine a peak of the input sinusoidal signal; comparing a differential signal amplitude with a differential signal amplitude window at approximately the peak of the input sinusoidal signal, wherein the differential signal amplitude is associated with the input sinusoidal signal; and generating an emitter modification signal in response to a determination that the differential signal amplitude is outside of the differential signal amplitude window. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for signal conditioning within an encoder, the apparatus comprising:
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means for storing an input sinusoidal signal at a plurality of times; means for determining a peak of the input sinusoidal signal based on the stored input sinusoidal signal; and means for generating an emitter modification signal in response to a determination that a differential signal amplitude is outside of a differential signal amplitude window at approximately the peak of the input sinusoidal signal. - View Dependent Claims (19, 20)
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Specification