Patent ID: 7777528
Filing Date: 2010-08-17
Classification: H03D

Abstract:
1. A phase detection module, comprising: a phase detection unit, for comparing a first input signal and a second input signal to generate a phase detection result; a plurality of comparators, coupled to the phase detection unit, for comparing the phase detection result with a plurality of predetermined voltages, respectively, to generate a plurality of comparing results; and a decision unit, coupled to the plurality of comparators, for determining a phase relationship between the first input signal and the second input signal according to the plurality of comparing results; wherein the phase detection result is a voltage value, the plurality of comparators include a first comparator, a second comparator and a third comparator, the first, the second and the third comparators compare the phase detection result with a first, a second and a third predetermined voltages to generate a first, a second and a third comparing results, respectively, where the first predetermined voltage is greater than the second predetermined voltage, and the second predetermined voltage is greater than the third predetermined voltage, and the first, the second and the third predetermined voltages are connected to input terminals with the same polarity of the first, the second and the third comparators, respectively.