Importance

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Abstract

A phase comparator has a first comparing circuit and a second comparing circuit. The first comparing circuit produces a first output pulse having a duration equal to a phase lead of a first input signal with respect to a phase of a second input signal. The first phase comparator also produces a second output pulse equal in duration to a phase lag of the first input signal with respect to the phase of the second input signal. The second comparing circuit produces a third pulse equal in duration to a phase lead of a third input signal with respect to a phase of a fourth input signal. The second comparator also produces a fourth output pulse equal in duration to a phase lag of the third input signal with respect to the phase of the fourth input signal. The phase comparator further includes a first combining circuit for combining the first output pulse with the third output pulse, a second combining circuit for combining the second output pulse with the fourth output pulse, and a first delay circuit for relatively delaying the first input signal with respect to the third input signal. Optionally, a second delay circuit delays the fourth input signal relative to the second input signal.

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First Claim