| 摘要 |
PURPOSE:To produce a signal having a time width of a certain ratio to the signal having a vairable period, by providing a saw-tooth wave generating circuit having a certain slope of variation of voltage and the period coinciding with an input puse wave pulse a DC reproducing circuit in which a parallel circuit of a diode and resistance is connected in series to a capacitor to be charged with the voltage of the saw-tooth wave generating circuit. CONSTITUTION:The period of a saw-tooth wave generating circuit 1 conincides with the applied signal at every application of the signal having a variable period to an input terminal Pi, and a saw-tooth wave having a certain slope of variation of voltage is transmitted to a DC reproducing circuit. A capacitor 2 of the DC reproducing circuit is charged by the saw-tooth wave, and the output wave at point Q is clamped toward the negative direction. In this case, the charging electric charge of the capacitor 2 is discharged through a resistance 3, and charging action is given to compensate the discharge component. Both the charging and discharging periods are decided to a certain ratio based on a ratio of a forward internal resistance between the resistance 3 and a diode 4. Thus a pulse can be obtained with a certain ratio secured to the input period. |
