| 摘要 |
A clock detector has a D flip-flop having a D terminal, a reset terminal and a clock terminal, a first saw-tooth wave signal generator having a first time constant for supplying to the D terminal a first logic signal resulting from a first saw-tooth wave signal, and a second saw-tooth wave signal generator having a second time constant which is larger than the first time constant for supplying to the reset terminal a second logic signal resulting from a second saw-tooth wave signal. A first clock pulse is supplied to the first and second saw-tooth wave signal generators, and a second clock pulse is applied to the clock terminal of the D flip-flop. When a reciprocal of a frequency of the first and second clock pulses falls within the first and second time constants, a normal clock pulse is detected.
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