| 摘要 |
A saw-tooth wave generating circuit is formed by providing a constant current source with negative feedback through an operational amplifier. The operational amplifier compares a reference voltage with the voltage across a resistor through which a current of the constant current source is flowing, to produce a control voltage for the constant current source. The saw-tooth wave is generated across a capacitor which is charged by the constant current source and is discharged through a transistor which receives a periodic pulse signal.
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