| 摘要 |
PURPOSE: To obtain the phase comparator immune to external disturbance with a wide phase comparison range whose phase comparison characteristic is linear by providing a phase difference detection means providing an output of a phase lag signal and a phase lead signal, a lead lag discrimination means and a signal selection means to the phase comparator. CONSTITUTION: A phase difference detection section 18 having MO storage element such as a latch and a lead lag discrimination circuit 23 having an RS flip-flop as a storage element are connected to input sections 16, 17 receiving a reference signal R and a variation signal V. The phase difference detection section 18 provides an output of a phase lag signal U(=R + the inverse of V) and a phase lead signal D(=The inverse of R+V) as a phase difference between the reference signal R and the variation signal V simultaneously. The flip-flop of the lead lag discrimination circuit 23 is set when both the reference signal R and the variation signal V are inverted and reset when the both are not inverted. The result is outputted to a control input of a switching device 19 as a discrimination signal Q. |
