Patent ID: 7936166
Filing Date: 2011-05-03
Classification: H03K

Abstract:
1. A method of extracting peak information from an amplitude varying sinusoidal waveform output from a sensor, the method comprising: gating a counter with a keying signal having a keying-signal period generated by a sinusoidal waveform associated with the amplitude varying sinusoidal waveform; receiving high frequency clock signals at the gated counter during keying-signal periods, wherein a clock-signal period is much less than the keying-signal period; disabling the counter at the end of each keying-signal period; generating a quarter-count value based on the disabling; and outputting a sample pulse associated with each keying-signal period, wherein if a current-keying-signal period is the same as a last-keying-signal period, the sample pulse is generated at a quarter-wave of the sinusoidal waveform, and wherein, if the current-keying-signal period differs from the last-keying-signal period, the associated output sample pulses are adjusted to the quarter-wave of the sinusoidal waveform in the next-keying-signal period.