| 摘要 |
Phase detection circuitry is disclosed that can detect phase differences from a quadrature phase relationship, without requiring extensive additional circuitry for driving and correcting the phase detection circuitry. The phase detection circuitry can measure plural or multiple pulse durations consecutively, without interruption to reset the circuit or store the values generated by the circuit, affording a much higher sampling rate and sampling a higher proportion of pulses than is conventional. Averaging of the phase data samples is also provided by measuring multiple pulses, so that phase changes are not instigated based upon a signal from an individual pulse duration that may differ significantly from the average. In addition to detecting quadrature phase relationships, the phase detection circuitry can be adjusted to compensate for a desired offset in one of the signals from quadrature, or can be set to detect other phase relationships. The phase detection circuitry can also be configured to automatically adjust for variations in temperature, voltage and processing conditions, and has a number of advantages for use with high-frequency, low-voltage signals.
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