Patent ID: 7756236

Claim:
A phase detector, comprising: a first output-latch half-transparent (OLHT) module having a first input terminal receiving a first input signal and a second input terminal receiving a second input signal; and a second OLHT module having a first input terminal receiving the second input signal and a second input terminal receiving the first input signal; wherein each of the first and the second OLHT modules comprises: a first logic operation unit receiving the first and the second input signals and outputting a first stage output signal in response thereto; a second logic operation unit electrically coupled to the first logic operation unit and receiving the second input signal and the first stage output signal and outputting a second stage output signal in response to the first stage output signal and the second input signal; and a latch circuit electrically connected to the second logic operation unit and receiving the second input signal, the second stage output signal and a logic low signal to latch a third stage output signal.