Phase difference detection and discrimination circuit and phase difference detection and discrimination method using the same

摘要

The present invention relates to a circuit for detecting and comparing the phase of two signals to determine a phase difference of another signal with respect to one reference signal among two signals. More particularly, the present invention broadens the comparison period into one period section by dividing two signals to be compared The present invention relates to a PDD circuit capable of detecting and comparing an accurate phase difference even when the phases of two signals are largely different from each other, and a phase difference detection and discrimination method using the PDD circuit.;The present invention is a signal processing apparatus comprising first dividing means for dividing a reference signal into two, second dividing means for dividing an input signal into two, second detecting means for detecting a phase difference of a signal from the first and second dividing means, Level detecting means for receiving the output of each of the two dividing means as an input and outputting a phase difference level (leading edge or delay of a signal) of the phase difference detecting means; State output means for outputting a two-divided signal, that is, a phase difference and a level difference between the reference signal and the input signal, as a three-state signal.