发明授权
- 专利标题： Preamplifier, optical receiver, optical termination device, and optical communication system
- 专利标题（中）： 前置放大器，光接收器，光终端设备和光通信系统
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申请号： US14413483申请日： 2013-01-16
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公开(公告)号： US09450542B2公开(公告)日： 2016-09-20
- 发明人: Daisuke Mita , Masaki Noda , Masamichi Nogami
- 申请人： Daisuke Mita , Masaki Noda , Masamichi Nogami
- 申请人地址： JP Tokyo
- 专利权人： Mitsubishi Electric Corporation
- 当前专利权人： Mitsubishi Electric Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, McClelland, Maier & Neustadt, L.L.P
- 国际申请： PCT/JP2013/050660 WO 20130116
- 国际公布： WO2014/112051 WO 20140724
- 主分类号： H03F3/08
- IPC分类号： H03F3/08 ; H03G3/30
摘要：
A current bypass circuit that passes part of a photocurrent output from a photodetector is connected to an input terminal of a current-to-voltage conversion amplifier circuit. A voltage obtained by level conversion of an output voltage by a voltage level conversion circuit is input into the current bypass circuit so that the current bypass circuit is turned on at a photocurrent that is smaller than the photocurrent at which a diode connected in parallel to a feedback resistor of the current-to-voltage conversion amplifier circuit is turned on. Consequently, the current-to-voltage conversion gain is switched in three stages according to the intensity of the photocurrent corresponding to an optical signal level.
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