| 摘要 |
A LED is provided to emit a light signal corresponding to an input signal. A PD receives the light signal, and generates a photovoltaic output. A MOSFET receives the photovoltaic output. A FET is provided. A first electrode of the FET is connected to the gate of the MOSFET. A second electrode of the FET is connected to a cathode of the PD through a resistor. A control electrode of the FET is connected to the cathode of the PD. A transistor is provided. A first electrode of the transistor is connected to the gate of the MOSFET. A second electrode of the transistor is connected to the source of the MOSFET. A control electrode of the transistor is connected to the second electrode of the FET. A diode is connected between the second electrode of the FET and the second electrode of the transistor.
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