| 摘要 |
An oscillating section 110 comprises feedback inverter INV1 and feedback resistor R2, and a waveform shaping section 120 includes a Schmitt circuit S1 of which transistors P3 and N3 respectively receive, as gate control signals, signals Gp3 and Gn3 generated by a stable-oscillation signal A1 and logic elements AND1, OR1 and INV3, respectively. The supply of power to the waveform shaping section 120 is performed through a low pass filter 111 comprising a resistor R1 and a capacitor C1. Thus a high potential power source VDD is supplied to the waveform shaping section 120 as a high potential power source VDDX. <IMAGE>
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