| 摘要 |
PURPOSE:To set the accurate time of duration even with a pulse having long time of duration, by applying an input pulse to a bistable FF to actuate an oscillator with the output of the FF and dividing the oscillated output with a prescribed dividing ratio to feed it back to the FF. CONSTITUTION:When an input pulse A fed to a terminal 1, a bistable FF circuit 2 is set. Then a signal B is fed to an output Q. At the same moment, an oscillating circuit 6 is actuated to transmit a repeating pulse C of a fixed frequency. The pulse C is counted N times by a frequency dividing circuit 7, and a pulse D is fed to the output of the circuit 7 to reset the circuit 2. As a result, a short pulse A is expanded to an output terminal 2 and then transmitted in the form of an output pulse B. The circuits are formed digitally, and the time of duration of the output pulse is decided by the dividing ratio of the circuit 7 as well as the oscillation frequency of the circuit 6 and can be set accurately. |
