发明名称 |
TRANSIMPEDANCE AMPLIFIER AND PON SYSTEM |
摘要 |
In a gain-switching-type transimpedance amplifier, in order to provide a technique capable of preventing unnecessary gain switching caused when noise is received, and preventing decrease in sensitivity caused when noise with a large input level is received, and then, a burst signal with a small input level is received, a transimpedance amplifier 5 includes: a pre-amplifier 200 to which the burst signal is inputted; an average detection start determination unit 300 for comparing an output of a pre-amplifier 200 with a first threshold voltage; an average detection circuit 400 for detecting and outputting an average value of the output of the pre-amplifier 200 during a certain period of time from a time point when the output of the pre-amplifier 200 exceeds the first threshold voltage; and a gain switching control unit 500 for determining whether to switch a gain of the pre-amplifier 200 based on an output of the average detection circuit 400. |
申请公布号 |
EP2388933(A4) |
申请公布日期 |
2014.06.25 |
申请号 |
EP20100731254 |
申请日期 |
2010.01.13 |
申请人 |
HITACHI, LTD. |
发明人 |
MASHIMO, DAISUKE;IKEDA, HIROKI;MORITA, YOSHINOBU |
分类号 |
H03G3/30;H03F3/08;H04B10/69 |
主分类号 |
H03G3/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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