| 摘要 |
To maintain the noise removal characteristic of a Schmidt trigger circuit stably. There are provided a Schmidt trigger circuit 10 constituted from a Vp/Vn setting unit 11 for determining the threshold level of an input signal and an RS latch unit 12 , a driver unit 13 having a low-pass filter function of passing a pulse signal with a predetermined width or more, output from the Schmidt trigger circuit 10 , and an operating current setting and sensor unit 14 for changing a supply voltage and supplying the changed supply voltage to an inverter INV 4 having the low-pass filter function so that the inverter INV 4 changes the width of a pulse to be passed through. The operating current setting and sensor unit 14 includes a sensor circuit 16 having a P-ch transistor MP 2 and an N-ch transistor MN 2 that are connected in series for setting the supply voltage. The inverter INV 4 is constituted from a P-ch transistor MP 1 that has the same shape as the P-ch transistor MP 2 and an N-ch transistor MN 1 that has the same shape as the N-ch transistor MN 2.
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