| 摘要 |
The isolator includes a photodiode (first photodiode), a first and a second amplifier, and a carrier discharging circuit. The photodiode is an input element that converts an optical signal input from an LED (signal source) into an electrical signal, and outputs the electrical signal to the first amplifier. The first amplifier includes two bipolar transistors, and amplifies the electrical signal output by the photodiode. The first amplifier also includes three resistances, one of which is a feedback resistance. The second amplifier has a similar structure to that of the first amplifier. The carrier discharging circuit is connected to the base of the bipolar transistor in the first amplifier and to the base of the bipolar transistor in the second amplifier, so as to discharge, when the photodiode turns off, a carrier accumulated in these bases when the photodiode PD1 is on.
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