| 摘要 |
PURPOSE:To absorb vibrations of the input voltage of the titled detecting circuit, by performing AC feedback on the comparator of the voltage level detecting circuit, and rising the threshold level when the output voltage is inversed by DC feedback. CONSTITUTION:An input voltage to be compared VIN is connected to an inversed input terminal of a comparator 11 and a point PA is connected to a non-inversed input terminal, then, a relative output VOUT is obtained by comparing the voltage by using the voltage at the point PA as a reference voltage. To the point PA DC feedback is performed by resistances R1-R4 and a diode D1 and AC feedback is also performed by a condenser C1. Since the upper limit of the threshold level is risen during the time constant decided by the AC feedback is kept constant when the input voltage coincides with the lower side of the threshold level decided by the DC feedback and the output voltage is inverted, vibrations of the input voltage can be absorbed. |
