| 摘要 |
A preamplifier is provided with a current feedback circuit including an amplifier for amplifying an input optical current and a feedback resistor connected between an input and an output of the amplifier, an average detecting circuit for detecting an average output voltage of the current feedback circuit and a current controlling circuit for distributing the input optical current in accordance with the detected average voltage. With this configuration, it is possible to generate an output voltage keeping an amplitude symmetry in a large voltage range.
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