OPTICAL RECEIVING AND AMPLIFYING DEVICE

PURPOSE:To simplify a circuit constitution and to cut off a noise output by detecting the output current of an avalanche photodiode and the gain of a variable gain amplifier circuit and ANDing them. CONSTITUTION:A dark current flowing to the avalanche photodiode 1 at no signal is detected by a no si...

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1. Verfasser:	SAITOU SHIGEAKI
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION
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creator	SAITOU SHIGEAKI
description	PURPOSE:To simplify a circuit constitution and to cut off a noise output by detecting the output current of an avalanche photodiode and the gain of a variable gain amplifier circuit and ANDing them. CONSTITUTION:A dark current flowing to the avalanche photodiode 1 at no signal is detected by a no signal detecting means comprising a resistor 8 and a differential amplifier 9, and a gain set value of the variable gain circuit 2 is detected by a gain detecting circuit 10. Further, the AND between outputs of the circuits 9 and 10 is obtained and it is applied to a signal cut-off circuit 6 from an AND gate 11 as a signal cut-off indication signal. As a result, the circuit constitution is simplified and also the circuit 6 at the output end is controlled to be cut off at no signal, thereby allowing to cut off a noise output appearing at the output.
format	Patent
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CONSTITUTION:A dark current flowing to the avalanche photodiode 1 at no signal is detected by a no signal detecting means comprising a resistor 8 and a differential amplifier 9, and a gain set value of the variable gain circuit 2 is detected by a gain detecting circuit 10. Further, the AND between outputs of the circuits 9 and 10 is obtained and it is applied to a signal cut-off circuit 6 from an AND gate 11 as a signal cut-off indication signal. As a result, the circuit constitution is simplified and also the circuit 6 at the output end is controlled to be cut off at no signal, thereby allowing to cut off a noise output appearing at the output.</description><language>eng</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; TRANSMISSION</subject><creationdate>1984</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19841006&DB=EPODOC&CC=JP&NR=S59176938A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,309,781,886,25566,76549</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19841006&DB=EPODOC&CC=JP&NR=S59176938A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>SAITOU SHIGEAKI</creatorcontrib><title>OPTICAL RECEIVING AND AMPLIFYING DEVICE</title><description>PURPOSE:To simplify a circuit constitution and to cut off a noise output by detecting the output current of an avalanche photodiode and the gain of a variable gain amplifier circuit and ANDing them. CONSTITUTION:A dark current flowing to the avalanche photodiode 1 at no signal is detected by a no signal detecting means comprising a resistor 8 and a differential amplifier 9, and a gain set value of the variable gain circuit 2 is detected by a gain detecting circuit 10. Further, the AND between outputs of the circuits 9 and 10 is obtained and it is applied to a signal cut-off circuit 6 from an AND gate 11 as a signal cut-off indication signal. As a result, the circuit constitution is simplified and also the circuit 6 at the output end is controlled to be cut off at no signal, thereby allowing to cut off a noise output appearing at the output.</description><subject>ELECTRIC COMMUNICATION TECHNIQUE</subject><subject>ELECTRICITY</subject><subject>TRANSMISSION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1984</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZFD3DwjxdHb0UQhydXb1DPP0c1dw9HNRcPQN8PF0iwRxXVzDPJ1deRhY0xJzilN5oTQ3g6Kba4izh25qQX58anFBYnJqXmpJvFdAsKmlobmZpbGFozExagDjdSQh</recordid><startdate>19841006</startdate><enddate>19841006</enddate><creator>SAITOU SHIGEAKI</creator><scope>EVB</scope></search><sort><creationdate>19841006</creationdate><title>OPTICAL RECEIVING AND AMPLIFYING DEVICE</title><author>SAITOU SHIGEAKI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JPS59176938A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1984</creationdate><topic>ELECTRIC COMMUNICATION TECHNIQUE</topic><topic>ELECTRICITY</topic><topic>TRANSMISSION</topic><toplevel>online_resources</toplevel><creatorcontrib>SAITOU SHIGEAKI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>SAITOU SHIGEAKI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>OPTICAL RECEIVING AND AMPLIFYING DEVICE</title><date>1984-10-06</date><risdate>1984</risdate><abstract>PURPOSE:To simplify a circuit constitution and to cut off a noise output by detecting the output current of an avalanche photodiode and the gain of a variable gain amplifier circuit and ANDing them. CONSTITUTION:A dark current flowing to the avalanche photodiode 1 at no signal is detected by a no signal detecting means comprising a resistor 8 and a differential amplifier 9, and a gain set value of the variable gain circuit 2 is detected by a gain detecting circuit 10. Further, the AND between outputs of the circuits 9 and 10 is obtained and it is applied to a signal cut-off circuit 6 from an AND gate 11 as a signal cut-off indication signal. As a result, the circuit constitution is simplified and also the circuit 6 at the output end is controlled to be cut off at no signal, thereby allowing to cut off a noise output appearing at the output.</abstract><oa>free_for_read</oa></addata></record>
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subjects	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION
title	OPTICAL RECEIVING AND AMPLIFYING DEVICE
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