Phase difference measuring device and phase comparison circuit adjusting method

• Main Authors: Nose, Koichi, Mizuno, Masayuki
• Format: Patent
• Language: English
• Published: 26.10.2010

A phase difference measuring device according to this invention has an object of shortening the measuring time, and includes a plurality of phase difference measuring circuits formed in a row, and phase difference conversion circuits each connected between adjacent phase difference measuring circuits. The phase difference measuring circuit receives first and second signals, respectively gives the first and second signals first and second delay amounts cumulatively a plurality of number of times, and, whenever giving the delay amounts, compares the phases of the first and second signals given the delay amounts, thereby determining which one of the phases leads the other. The phase difference conversion circuit receives the first and second signals input to the phase difference measuring circuit in the preceding stage, respectively gives the first and second signals a first total delay amount (Tr) as a total of the first delay amounts and a second total delay amount (Ts) as a total of the second delay amounts given by the phase difference measuring circuit in the preceding stage, and outputs the first and second signals to the phase difference measuring circuit in the succeeding stage.