GB1439654A – Input circuit for optical signal receiver
– Google Patents
GB1439654A – Input circuit for optical signal receiver
– Google Patents
Input circuit for optical signal receiver
Info
Publication number
GB1439654A
GB1439654A
GB2836873A
GB2836873A
GB1439654A
GB 1439654 A
GB1439654 A
GB 1439654A
GB 2836873 A
GB2836873 A
GB 2836873A
GB 2836873 A
GB2836873 A
GB 2836873A
GB 1439654 A
GB1439654 A
GB 1439654A
Authority
GB
United Kingdom
Prior art keywords
resistor
photodiode
typically
input
june
Prior art date
1972-06-19
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
GB2836873A
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.)
Computer Transmission Corp
Original Assignee
Computer Transmission Corp
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.)
1972-06-19
Filing date
1973-06-14
Publication date
1976-06-16
1973-06-14
Application filed by Computer Transmission Corp
filed
Critical
Computer Transmission Corp
1976-06-16
Publication of GB1439654A
publication
Critical
patent/GB1439654A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03F—AMPLIFIERS
H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
H03F1/56—Modifications of input or output impedances, not otherwise provided for
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
Abstract
1439654 Photo-electric receivers COMPUTER TRANSMISSION CORP 14 June 1973 [19 June 1972] 28368/73 Heading G1A An input circuit for optically sensitive receivers comprises a series combination of a photodiode and a first resistor; means for applying a p.d. across the series combination; amplifier means having its input connected to the junction between the photodiode and the first resistor; and a second resistor coaxially surrounding the first resistor and coupled to the output of the amplifier means. A photodiode 10 in series with a first resistor 21, typically 10 megohms, is connected to a positive supply 30, via resistors 26, 25, the latter forming the drain load of an input FET 23. Coaxially surrounding the first resistor 21 is a second resistor 22, typically 500 ohms, connected in a bootstrap circuit via a capacitor 41 to the drain electrode of the FET 23 which is made to follow the potential variations of the source 31 by being coupled to the emitter of a transistor .32 driven by the source 31. The voltage gain from the first resistor 21 to the second resistor 22 is typically 0.98, whereby the effective amplifier input capacitance is substantially reduced and the bandwidth improved. The bandwidth may be further extended by a transistor 42 having a capacitive emitter impedance 44 and an inductive collector load 43. The coaxial resistors 21, 22 of substantially equal length L may be of deposited carbon or wirewound on ceramic bases to give uniform respective resistance per unit length. The ratio of length L to outer diameter D should be at least two, preferably four. The end caps 21a, 22a are mutually isolated, while the end caps 21b, 22b may be inter-connected for common earthing. A component layout at the rear of a shielded optical receiver is described Figs. 5, 6 (not shown).
GB2836873A
1972-06-19
1973-06-14
Input circuit for optical signal receiver
Expired
GB1439654A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US26382272A
1972-06-19
1972-06-19
Publications (1)
Publication Number
Publication Date
GB1439654A
true
GB1439654A
(en)
1976-06-16
Family
ID=23003367
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2836873A
Expired
GB1439654A
(en)
1972-06-19
1973-06-14
Input circuit for optical signal receiver
Country Status (10)
Country
Link
US
(1)
US3792256A
(en)
JP
(1)
JPS579260B2
(en)
CA
(1)
CA996190A
(en)
DE
(1)
DE2331007C2
(en)
FR
(1)
FR2189951B1
(en)
GB
(1)
GB1439654A
(en)
IL
(1)
IL42533A
(en)
IT
(1)
IT989294B
(en)
NL
(1)
NL7308533A
(en)
SE
(1)
SE388945B
(en)
Families Citing this family (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4888562A
(en)
*
1987-09-09
1989-12-19
National Semiconductor Corporation
Low noise, high speed current or voltage amplifier
JP3937426B2
(en)
*
2001-07-16
2007-06-27
日本電気株式会社
Preamplifier circuit
Family Cites Families (9)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2587589A
(en)
*
1947-11-03
1952-03-04
Moore Electronic Lab Inc
Sealed lens phototube
US2724761A
(en)
*
1951-08-18
1955-11-22
Bell Telephone Labor Inc
High tolerance impedance elements and methods of making them
DE951746C
(en)
*
1952-11-20
1956-10-31
Felten & Guilleaume Carlswerk
Electrical measuring resistor
US2877355A
(en)
*
1955-03-28
1959-03-10
Ibm
Bistable phototube
US3223938A
(en)
*
1962-05-11
1965-12-14
Bendix Corp
Emitter follower transistor amplifier
DE1216981B
(en)
*
1963-09-12
1966-05-18
Licentia Gmbh
Low resistance measuring resistor for heavy current
US3523189A
(en)
*
1968-05-23
1970-08-04
Trw Inc
Light-sensitive circuit in which the effective load of a phototransistor is bootstrapped
US3657543A
(en)
*
1968-07-24
1972-04-18
Optronix Inc
Optical communications system with improved bias control for photosensitive input device
US3705986A
(en)
*
1971-01-25
1972-12-12
Computer Transmission Corp
Optical data transmission system
1972
1972-06-19
US
US00263822A
patent/US3792256A/en
not_active
Expired – Lifetime
1973
1973-06-13
CA
CA173,993A
patent/CA996190A/en
not_active
Expired
1973-06-14
GB
GB2836873A
patent/GB1439654A/en
not_active
Expired
1973-06-16
FR
FR7322146A
patent/FR2189951B1/fr
not_active
Expired
1973-06-18
SE
SE7308561A
patent/SE388945B/en
unknown
1973-06-18
IL
IL42533A
patent/IL42533A/en
unknown
1973-06-18
JP
JP6863073A
patent/JPS579260B2/ja
not_active
Expired
1973-06-18
DE
DE2331007A
patent/DE2331007C2/en
not_active
Expired
1973-06-19
NL
NL7308533A
patent/NL7308533A/xx
not_active
Application Discontinuation
1973-06-19
IT
IT25586/73A
patent/IT989294B/en
active
Also Published As
Publication number
Publication date
DE2331007C2
(en)
1985-11-21
US3792256A
(en)
1974-02-12
DE2331007A1
(en)
1974-01-17
JPS49109083A
(en)
1974-10-17
FR2189951A1
(en)
1974-01-25
IL42533A0
(en)
1973-08-29
JPS579260B2
(en)
1982-02-20
NL7308533A
(en)
1973-12-21
IL42533A
(en)
1976-05-31
CA996190A
(en)
1976-08-31
IT989294B
(en)
1975-05-20
SE388945B
(en)
1976-10-18
FR2189951B1
(en)
1977-02-11
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Legal Events
Date
Code
Title
Description
1976-10-27
PS
Patent sealed [section 19, patents act 1949]
1985-02-06
PCNP
Patent ceased through non-payment of renewal fee
