| 摘要 |
A waveform shaping circuit which includes a voltage comparator having one input which is supplied with a reference voltage whose amplitude is determined by two voltage dividing resistors which are serially interconnected across a source voltage and having its other input supplied with a voltage across a capacitor which is charged with the source voltage in the absence of a square input pulse and which is discharged in the presence of the input pulse. In order to vary the reference voltage in the presence of the input pulse, a resistor and an NPN common emitter transistor are connected across that voltage dividing resistor which is directly connected to ground and the input pulse is supplied to the base electrode of the transistor.
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