发明名称 |
Light detecting circuit. |
摘要 |
A light-detecting circuit in which noise superposed on a bias voltage of a photodiode is substantially canceled without the aid of a filter circuit employing an inductor. The photodiode is connected between a bias voltage terminal and an inverting terminal of a main amplifier, the latter being implemented with a differential amplifier or a comparator. A capacitance device is connected between the same bias voltage terminal and the other (noninverting) input terminal of the main amplifier. The capacitance device may be either a physical capacitor or a second photodiode which, in either case, should have a capacitance equal to the parasitic capacitance of the first photodiode. |
申请公布号 |
EP0127743(A2) |
申请公布日期 |
1984.12.12 |
申请号 |
EP19840103653 |
申请日期 |
1984.04.03 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES LIMITED |
发明人 |
MORITA, TETSUO;NISHIE, MITSUAKI |
分类号 |
H04B10/60;G01J1/44;H03F3/08;H04B1/10;H04B10/2507;H04B10/40;H04B10/50;H04B10/69 |
主分类号 |
H04B10/60 |
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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