| 摘要 |
PURPOSE:To simplify a phase comparing circuit by providing either input of an exclusive OR circuit with a frequency divider for obtaining a frequency division output pulse synchronizing with the pulse edge of either input of the exclusive OR circuit. CONSTITUTION:To the inputs of an exclusive OR circuit, T type flip-flop circuits F1 and F2 are connected, respectively. The input terminals T of those T type flip- flops F1 and F2 are connected to the input terminals IN1 and IN2 of a comparing circuit, and their output terminals Q are connected to the input terminals of the exclusive OR circuit EX, whose output is further connected to a terminal OUT. Consequently, pulses obtained through the frequency division of the F1 and F2 are inputted to the inputs of the EX and at the terminal OUT of the EX, a signal appears which corresponds to a phase difference between the F1 and F2. |
