GB1481815A - Opto-electric couplers - Google Patents

Opto-electric couplers

Info

Publication number
GB1481815A
GB1481815A GB4836374A GB4836374A GB1481815A GB 1481815 A GB1481815 A GB 1481815A GB 4836374 A GB4836374 A GB 4836374A GB 4836374 A GB4836374 A GB 4836374A GB 1481815 A GB1481815 A GB 1481815A
Authority
GB
United Kingdom
Prior art keywords
input
circuit
opto
output
equal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4836374A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ferranti International PLC
Original Assignee
Ferranti PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ferranti PLC filed Critical Ferranti PLC
Priority to GB4836374A priority Critical patent/GB1481815A/en
Publication of GB1481815A publication Critical patent/GB1481815A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
    • H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
    • H03F3/087—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light with IC amplifier blocks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
    • H04B10/802—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections for isolation, e.g. using optocouplers

Abstract

1481815 Transistor amplifiers FERRANTI Ltd 31 Oct 1975 [8 Nov 1974] 48363/74 Heading H3T An opto-electric coupler comprises a light source 10 and two photoconductive devices 12, 14 exposed thereto, one of the latter, 12, being in an output circuit 20, the other, 14, being in an input circuit 36 together with the source 10, whereby the source is driven so as to lineauze the relation between input and output signals. The light source 10 may be a gallium arsenidephosphide LED, and the photoconductive devices 12, 14 may each be a phototransistor Darlington pair. The input circuit may comprise a differential amplifier 40 having input terminal 46 earthed, the other input terminal 38 being maintained as virtual earth by negative feedback via the opto-electrical coupling 10-14. Thus the current through 14 is held equal to the input current at terminal 56. If 12 matches 14 and the optical paths 34, 58 are similar, and if the resistors 32, 50 are equal the output from amplifier 18 will equal the input voltage, and will follow variations over a range typically 0-10 volts. The circuit functions as described so far with positive input voltages, but for a bipolar input, resistor 59 may be added to bias diode 10 to a middle part of its characteristic, a corresponding resistor 60 being added to the output circuit. For handling only negative input voltages a modified circuit (not shown) without 59 and 60, may have the transistor 52 replaced by an NPN transistor, and the diode 10 and the pair 14 oppositely poled, with corresponding changes in the output circuit. In a thin film embodiment, Fig. 2 (not shown), four linkages (A, B, C, and D) off the structure may be either open or closed, different arrangements providing for (a) unipolar or bipolar operation, (b) differing input amplitudes or (c) differing input impedances.
GB4836374A 1975-10-31 1975-10-31 Opto-electric couplers Expired GB1481815A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4836374A GB1481815A (en) 1975-10-31 1975-10-31 Opto-electric couplers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4836374A GB1481815A (en) 1975-10-31 1975-10-31 Opto-electric couplers

Publications (1)

Publication Number Publication Date
GB1481815A true GB1481815A (en) 1977-08-03

Family

ID=10448349

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4836374A Expired GB1481815A (en) 1975-10-31 1975-10-31 Opto-electric couplers

Country Status (1)

Country Link
GB (1) GB1481815A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0434466A2 (en) * 1989-12-21 1991-06-26 Kabushiki Kaisha Toshiba Stabilized-feedback control device for semiconductor lasers
EP0766397A1 (en) * 1995-09-29 1997-04-02 Matsushita Electric Industrial Co., Ltd. Driver for light emitting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0434466A2 (en) * 1989-12-21 1991-06-26 Kabushiki Kaisha Toshiba Stabilized-feedback control device for semiconductor lasers
EP0434466A3 (en) * 1989-12-21 1992-01-15 Kabushiki Kaisha Toshiba Stabilized-feedback control device for semiconductor lasers
USRE35766E (en) * 1989-12-21 1998-04-07 Kabushiki Kaisha Toshiba Stabilized-feedback control device for semiconductor lasers
EP0766397A1 (en) * 1995-09-29 1997-04-02 Matsushita Electric Industrial Co., Ltd. Driver for light emitting device
US5734170A (en) * 1995-09-29 1998-03-31 Matsushita Electric Industrial Co., Ltd. Driver for light emitting device

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee