| 摘要 |
PURPOSE: A delay circuit is provided to stop the oscillation of a ring oscillator by delaying the rising edge and the falling edge of an input signal as the cycle of a specified fixed length. CONSTITUTION: A delay circuit(100) comprises an edge detector and a counter. An edge detector(110) outputs a first control signal in response to the rising edge or the falling edge of the input signal. A counter counts the number of pulse of an output pulse signal is outputted from the ring oscillator. The counter(130) outputs a second control signal when it is reached to a predetermined count number. A ring oscillator(120) comprises a basis delay circuit controlling the pulse length of an output pulse signal according to the first setting signal.
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