GB1315115A - Wall-coverings - Google Patents

Wall-coverings

Info

Publication number
GB1315115A
GB1315115A GB1315115DA GB1315115A GB 1315115 A GB1315115 A GB 1315115A GB 1315115D A GB1315115D A GB 1315115DA GB 1315115 A GB1315115 A GB 1315115A
Authority
GB
United Kingdom
Prior art keywords
gain control
automatic gain
resistance
photo
transistor
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
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Publication of GB1315115A publication Critical patent/GB1315115A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/691—Arrangements for optimizing the photodetector in the receiver
    • H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • 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
    • H03F3/082—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light with FET's
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1315115 Automatic gain control for photodiodes or photo-transistor PLESSEY CO Ltd 27 May 1970 [28 May 1969] 26876/69 Heading G1A [Also in Division H4] An automatic gain control system for a photodiode 1 or photo-transistor in a circuit, Fig. 2, for detecting amplitude modulated light comprises a load resistance in the form of a F. E. T. 4, the resistance of which is varied with the intensity of light incident upon the diode to achieve automatic gain control. The output voltage developed across the F.E.T. 4 is compared with a fixed reference voltage by means of an operational amplifier 9 and the difference is applied through a feedback line to the gate of the F. E. T. 4 so as to bring about a change in its resistance, thereby ensuring a constant voltage output of the diode. The modulated signals are detected by virtue of a capacitor 12 the feedback line to afford a predetermined time constant which limits the speed of response of the circuit.
GB1315115D 1969-05-28 1969-05-28 Wall-coverings Expired GB1315115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2686769 1969-05-28

Publications (1)

Publication Number Publication Date
GB1315115A true GB1315115A (en) 1973-04-26

Family

ID=10250471

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1315115D Expired GB1315115A (en) 1969-05-28 1969-05-28 Wall-coverings

Country Status (1)

Country Link
GB (1) GB1315115A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077648A2 (en) * 1981-10-16 1983-04-27 The Babcock & Wilcox Company Circuits for regulating the output voltage of a device, for instance a photocell
EP0149769A2 (en) * 1984-01-20 1985-07-31 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Apparatus for optoelectronically registering the rotational speed of a shaft
EP0451748A2 (en) * 1990-04-10 1991-10-16 Alcatel SEL Aktiengesellschaft Optical signal receiver
EP0514592A1 (en) * 1991-05-22 1992-11-25 REER S.p.A. A detector of pulsed light signals, particularly for protection barriers and infrared remote controls
EP0748041A1 (en) * 1995-06-06 1996-12-11 Rockwell International Corporation Compact photosensor circuit having automatic intensity range control

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077648A2 (en) * 1981-10-16 1983-04-27 The Babcock & Wilcox Company Circuits for regulating the output voltage of a device, for instance a photocell
EP0077648A3 (en) * 1981-10-16 1983-06-08 The Babcock & Wilcox Company Circuits for regulating the output voltage of a device, for instance a photocell
EP0149769A2 (en) * 1984-01-20 1985-07-31 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Apparatus for optoelectronically registering the rotational speed of a shaft
EP0149769A3 (en) * 1984-01-20 1986-11-05 Dr.Ing.H.C. F. Porsche Aktiengesellschaft Apparatus for optoelectronically registering the rotational speed of a shaft
EP0451748A2 (en) * 1990-04-10 1991-10-16 Alcatel SEL Aktiengesellschaft Optical signal receiver
EP0451748A3 (en) * 1990-04-10 1992-01-08 Standard Elektrik Lorenz Aktiengesellschaft Optical signal receiver
EP0514592A1 (en) * 1991-05-22 1992-11-25 REER S.p.A. A detector of pulsed light signals, particularly for protection barriers and infrared remote controls
EP0748041A1 (en) * 1995-06-06 1996-12-11 Rockwell International Corporation Compact photosensor circuit having automatic intensity range control

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Legal Events

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