| 摘要 |
A waveform shaping apparatus has a first integrating circuit 152, a second integrating circuit 153, and a first comparison circuit 154. The first and second integrated circuits 152 and 153 are connected in series with each other, and so operate that, when a voltage signal loner than a predetermined period and larger than a predetermined amplitude is fed to the first integrating circuit 152, the voltage signal is made higher than a first reference voltage and is then output to he second integrating circuit 153 and, when the voltage signal fed to the first integrating circuit 152 is shorter than the predetermined period, the voltage signal is made lower than the first reference voltage and is then outputted from the second integrating circuit 153. The first comparison circuit 154 compares a voltage contained in the voltage signal outputted from the second integrating circuit 153 with the first reference voltage, and outputs the comparison result. This configuration prevents the waveform shaping apparatus from outputting an erroneous pulse resulting from a nose signal shorter than the time width of a control signal and larger than the amplitude of the control signal.
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