| 摘要 |
PURPOSE:To pick up a pulse corresponding to a desired analog waveform when the analog waveform transmitted continuously is formed into pulse, by providing a circuit changing a comparison voltage inputted to a comparator with an output of a monostable multivibrator. CONSTITUTION:When an input signal 11 of the comparator 12 is 0, an output signal 14 of the comparator 12 goes to H and an output -Q of the monostable multivibrator 15 goes to H. In this case, an output of an inverter 19 goes to L and a switching transistor TR20 is turned off. In this state, a voltage at a comparison signal is a voltage V3 determined with a voltage of the signal 14, a power supply voltage V and resistors R11-R13. When the voltage of the signal 11 is higher than the V3, the voltage of the signal 13 is a voltage V4 determined by the voltage of the signal 14, the voltage V and the resistors R11-R13. When the voltage of the signal 11 is smaller than the V4, the TR20 is turned on and the voltage of the signal 13 is a voltage V5 determined by the voltage of the signal 14, the voltage V and the resistors R11-R14. Next, when the voltage of the signal 11 exceeds V5, the output signal 18 goes to H. The operation like this is repeated. |
