| 摘要 |
PURPOSE:To accurately count the number of times of fluctuation of signal, by feeding the input signal to the integration circuit with reversed conduction and by the level comparison of the difference between the output of the integration circuit and the input signal. CONSTITUTION:The fluctuated signal input is fed to (-) of the differential amplifier 1 and also to the selection circuits 2 and 3. The output of the differential amplifier 1 is fed to (-) of the comparator 4 and the output is fed to the two drivers 6 and 7. When the output of the comparator 4 is (+), the driver 7 is ON and the driver 6 is OFF, and when the output of the comparator 4 is (-), 7 is OFF and 6 is ON. In the selection circuits 2 and 3, the diodes 8 and 9 are inserted in reverse connection for conduction, and they are ON when the drivers are ON. The output of the selection circuits is fed to the integration circuit 10 as the (+) input of the differential amplifier 1. As the (+) input of the comparator 4, the comparator set value added with the hysteresis of output is fed. |
