| 摘要 |
PURPOSE:To detect the state of synchronism between a high frequency and a low frequency signal, by supplying the high frequency signal to a flip-flop as data after frequency division, and also supplying the low frequency signal as a clock signal simultaneously. CONSTITUTION:A reference signal inputted to a terminal 1 is inputted to the clock side of a flip-flop 15. The output signal of a voltage controlled oscillator 4 is inputted to a frequency divider 13, whose frequency division output is supplied to the data side of the flip-flop 15. The flip-flop 15 outputs the state of the data signal at a rise of the clock signal. A monostable multivibrator 16 is driven by the output signal of the flip-flop 15. While a phase-lock loop is locked, the output signal of the multivibrator 16 has a specified level. Thus, step-out detection performed by the simple constitution. |
