| 摘要 |
A waveform generating circuit includes a constant current circuit that supplies a constant current through a power source; a current mirror circuit that flows an output current that is n times an input current; and a switching circuit that switches a flowing direction of the current in the constant current circuit between the current mirror circuit and the output terminal according to the logical level of the rectangle input signal. The waveform generating circuit generates a triangle wave having a falling slope waveform that is n times the rising slope. On the other hand, the waveform generating circuit that receives an inverted signal of the signal generates a triangle wave and its voltage is compared with another in the comparator to generate an output signal.
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