| 摘要 |
A negative voltage generating circuit includes a pulse generator U1, a switch, a resistor, a first capacitor, a first diode, a second diode, and a second capacitor. The pulse generator includes a positive voltage input pin coupled to a power supply, an oscillating output pin, and a negative voltage input pin. The switch includes a first terminal coupled to the oscillating output pin, a second terminal coupled to one terminal of the first capacitor, and coupled to the power supply via the resistor, and a third terminal being grounded. Another terminal of the first capacitor is coupled to the anode of the fist diode and the cathode of the second diode. The cathode of the first diode is grounded. The anode of the second diode is coupled to the positive voltage input pin of the pulse generator, and is coupled to ground via the second capacitor.
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