Patent ID: 7554079

Claim:
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.