Patent ID: 7428284

Claim:
A dual mode phase detector, comprising: a single-edge first phase detector receiving first and second input signals and generating at least one output signal indicative of only a phase relationship between a first predetermined transition of the first input signal and the first predetermined transition of the second input signal, the first predetermined transition being a transition from a first logic level to a second logic level; a dual-edge second phase detector receiving the first and second input signals and generating at least one output signal, the at least one output signal being indicative of both a phase relationship between the first predetermined transition of the first input signal and the first predetermined transition of the second input signal and a phase relationship between a second predetermined transition of the first input signal and the second predetermined transition of the second input signal, the second predetermined transition being a transition from the second logic level to the first logic level; and a selector selecting the at least one output signal from the first phase detector if the first and second input signals have a first phase relationship and selecting the at least one output signal from the second phase detector if the first and second input signals have a second phase relationship that is different from the first phase relationship.