| 摘要 |
PURPOSE:To improve the effect of noise rejection, by providing a circuit which makes a terminal voltage of a capacitor coincident with an input signal voltage when a difference between input and output voltages exceeds a prescribed value, in parallel with a resistor of a filter circuit including a CR time constant circuit. CONSTITUTION:A noise rejection circuit is formed with a filter circuit constituting a CR time constant circuit consisting of a resistor R and a capacitor C. A parallel circuit of diodes D1, D2 connected in a direction opposite to each other is connected in parallel with the resistor R. The diodes D1, D2 form a blind zone. In this circuit, when a voltage difference between the input and output exceeds the blind zone of the diodes, a terminal voltage of the capacitor C is made equal to the input signal voltage. Thus, a noise component with a small voltage does not appear at the output side, and the noise rejection effect can be improved without time delay. |
