发明名称 |
Signal-off detection circuit and optical receiving device using the same |
摘要 |
This invention offers a signal-off detection circuit allowing arbitrary setting of an issuing time (response time) of a signal disconnection alarm without being affected by a time constant of a direct current feedback circuit giving an offset voltage to an amplifier for amplifying a data signal. Input data signals per a fixed time determined by a timer is counted by a counter, and a count value is compared with a predetermined set value in a comparator. A configuration is made such that a signal disconnection alarm may be issued by detecting a disconnection state of the data signal according to a comparison result. Thereby, an issuing time of a signal disconnection alarm can be set without being affected by a time constant of a direct current feedback circuit giving an offset voltage to an amplifier for amplifying a data signal of a preceding stage.
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申请公布号 |
US2003094975(A1) |
申请公布日期 |
2003.05.22 |
申请号 |
US20020292434 |
申请日期 |
2002.11.13 |
申请人 |
NEC CORPORATION |
发明人 |
NOGUCHI HIDEMI;TATEYAMA TETUO;KIMURA MADOKA |
分类号 |
H04B10/04;H03K5/08;H03K5/19;H04B10/06;H04B10/14;H04B10/26;H04B10/28;H04B17/00;H04L25/02;(IPC1-7):H03K9/08 |
主分类号 |
H04B10/04 |
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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