CONSTANT-CURRENT SOURCE CIRCUIT
PURPOSE:To obtain exactly a fixed ratio of an output current to a reference current, by combining suitably the first-the eighth transistors and the first-the fourth diodes so that they are operated by low voltage. CONSTITUTION:A titled circuit is provided with a transistor Q7 for constituting a cons...
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| creator | KAJIWARA JIYUNJI OKADA KOUZOU |
| description | PURPOSE:To obtain exactly a fixed ratio of an output current to a reference current, by combining suitably the first-the eighth transistors and the first-the fourth diodes so that they are operated by low voltage. CONSTITUTION:A titled circuit is provided with a transistor Q7 for constituting a constant-current circuit formed by coupling a diode D3 and a mirror, and also is provided with a constant-current circuit constituted of transistors Q8-Q10 which uses a collector current of the transistor Q7 as a reference current. The constant-current circuit is constituted of only transistors Q3, Q4, therefore, even if the reference transistor Q3 is connected with a diode, influence due to a base current of the transistor Q4 is small. Accordingly, collector currents of the transistors Q7, Q4 and Q3 are equal and are decided exactly by a resistance R2. An output current to the reference current being the collector current of the transistor Q7, that is to say, a ratio of a collector current of a transistor group 10 becomes ''1''. |
| format | Patent |
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CONSTITUTION:A titled circuit is provided with a transistor Q7 for constituting a constant-current circuit formed by coupling a diode D3 and a mirror, and also is provided with a constant-current circuit constituted of transistors Q8-Q10 which uses a collector current of the transistor Q7 as a reference current. The constant-current circuit is constituted of only transistors Q3, Q4, therefore, even if the reference transistor Q3 is connected with a diode, influence due to a base current of the transistor Q4 is small. Accordingly, collector currents of the transistors Q7, Q4 and Q3 are equal and are decided exactly by a resistance R2. An output current to the reference current being the collector current of the transistor Q7, that is to say, a ratio of a collector current of a transistor group 10 becomes ''1''.</description><language>eng</language><subject>AMPLIFIERS ; BASIC ELECTRONIC CIRCUITRY ; CONTROLLING ; ELECTRICITY ; PHYSICS ; REGULATING ; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES</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=19840112&DB=EPODOC&CC=JP&NR=S595322A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25544,76293</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19840112&DB=EPODOC&CC=JP&NR=S595322A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>KAJIWARA JIYUNJI</creatorcontrib><creatorcontrib>OKADA KOUZOU</creatorcontrib><title>CONSTANT-CURRENT SOURCE CIRCUIT</title><description>PURPOSE:To obtain exactly a fixed ratio of an output current to a reference current, by combining suitably the first-the eighth transistors and the first-the fourth diodes so that they are operated by low voltage. CONSTITUTION:A titled circuit is provided with a transistor Q7 for constituting a constant-current circuit formed by coupling a diode D3 and a mirror, and also is provided with a constant-current circuit constituted of transistors Q8-Q10 which uses a collector current of the transistor Q7 as a reference current. The constant-current circuit is constituted of only transistors Q3, Q4, therefore, even if the reference transistor Q3 is connected with a diode, influence due to a base current of the transistor Q4 is small. Accordingly, collector currents of the transistors Q7, Q4 and Q3 are equal and are decided exactly by a resistance R2. An output current to the reference current being the collector current of the transistor Q7, that is to say, a ratio of a collector current of a transistor group 10 becomes ''1''.</description><subject>AMPLIFIERS</subject><subject>BASIC ELECTRONIC CIRCUITRY</subject><subject>CONTROLLING</subject><subject>ELECTRICITY</subject><subject>PHYSICS</subject><subject>REGULATING</subject><subject>SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1984</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZJB39vcLDnH0C9F1Dg0KcvULUQj2Dw1ydlVw9gxyDvUM4WFgTUvMKU7lhdLcDPJuriHOHrqpBfnxqcUFicmpeakl8V4BwaaWpsZGRo7GhFUAAHpcIWw</recordid><startdate>19840112</startdate><enddate>19840112</enddate><creator>KAJIWARA JIYUNJI</creator><creator>OKADA KOUZOU</creator><scope>EVB</scope></search><sort><creationdate>19840112</creationdate><title>CONSTANT-CURRENT SOURCE CIRCUIT</title><author>KAJIWARA JIYUNJI ; OKADA KOUZOU</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JPS595322A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1984</creationdate><topic>AMPLIFIERS</topic><topic>BASIC ELECTRONIC CIRCUITRY</topic><topic>CONTROLLING</topic><topic>ELECTRICITY</topic><topic>PHYSICS</topic><topic>REGULATING</topic><topic>SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES</topic><toplevel>online_resources</toplevel><creatorcontrib>KAJIWARA JIYUNJI</creatorcontrib><creatorcontrib>OKADA KOUZOU</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>KAJIWARA JIYUNJI</au><au>OKADA KOUZOU</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>CONSTANT-CURRENT SOURCE CIRCUIT</title><date>1984-01-12</date><risdate>1984</risdate><abstract>PURPOSE:To obtain exactly a fixed ratio of an output current to a reference current, by combining suitably the first-the eighth transistors and the first-the fourth diodes so that they are operated by low voltage. CONSTITUTION:A titled circuit is provided with a transistor Q7 for constituting a constant-current circuit formed by coupling a diode D3 and a mirror, and also is provided with a constant-current circuit constituted of transistors Q8-Q10 which uses a collector current of the transistor Q7 as a reference current. The constant-current circuit is constituted of only transistors Q3, Q4, therefore, even if the reference transistor Q3 is connected with a diode, influence due to a base current of the transistor Q4 is small. Accordingly, collector currents of the transistors Q7, Q4 and Q3 are equal and are decided exactly by a resistance R2. An output current to the reference current being the collector current of the transistor Q7, that is to say, a ratio of a collector current of a transistor group 10 becomes ''1''.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | AMPLIFIERS BASIC ELECTRONIC CIRCUITRY CONTROLLING ELECTRICITY PHYSICS REGULATING SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES |
| title | CONSTANT-CURRENT SOURCE CIRCUIT |
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