GB1124351A - Improvements in or relating to electric circuits - Google Patents

Improvements in or relating to electric circuits

Info

Publication number
GB1124351A
GB1124351A GB3947865A GB3947865A GB1124351A GB 1124351 A GB1124351 A GB 1124351A GB 3947865 A GB3947865 A GB 3947865A GB 3947865 A GB3947865 A GB 3947865A GB 1124351 A GB1124351 A GB 1124351A
Authority
GB
United Kingdom
Prior art keywords
amplifier
send
terminal
input
wire
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
GB3947865A
Inventor
Charles Malcolm Burbury
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB3947865A priority Critical patent/GB1124351A/en
Publication of GB1124351A publication Critical patent/GB1124351A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/03—Hybrid circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Amplifiers (AREA)

Abstract

1,124,351. Hybrids. GENERAL ELECTRIC CO. Ltd. 14 Sept., 1966 [15 Sept., 1965], No. 39478/65. Heading H4R. A circuit for transition from four-wire to two-wire signal paths comprises two pairs of a four-wire line terminated in a " send " amplifier 4 and a " receive " amplifier 5 respectively. A " hybrid " has a terminal 1 connected to the two-wire line, a terminal 2 connected to the input of the " send " amplifier 4 and a terminal 3 connected to the output of the " receive " amplifier 5. The remaining wire of the twowire line, the other input of the " send " amplifier 4 and the other output of the " receive " amplifier 5 are connected to a common earth line 6. The input stage of the " send " amplifier is the emitter electrode of a PNP transistor 7 connected in common base configuration. The input impedance is reduced by negative feedback (not shown). The " hybrid " comprises a PNP transistor 12 providing one of two paths to the input of the " send " amplifier 4. When a source is connected to the terminal 1, the applied signal is transmitted by the transistor 12 to the " send " input terminal. In the case of a received signal from the receive pair of the four-wire line, the transistor 12 acts as an emitter-follower and a signal is developed across the two-wire line connected to the terminal 1. The " receive " amplifier 5 also supplies signals through a balancing resistor 14 and the transistor 12 to the " send " amplifier 4 but these signals are of opposite phase and cancel.
GB3947865A 1965-09-15 1965-09-15 Improvements in or relating to electric circuits Expired GB1124351A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3947865A GB1124351A (en) 1965-09-15 1965-09-15 Improvements in or relating to electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3947865A GB1124351A (en) 1965-09-15 1965-09-15 Improvements in or relating to electric circuits

Publications (1)

Publication Number Publication Date
GB1124351A true GB1124351A (en) 1968-08-21

Family

ID=10409768

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3947865A Expired GB1124351A (en) 1965-09-15 1965-09-15 Improvements in or relating to electric circuits

Country Status (1)

Country Link
GB (1) GB1124351A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855430A (en) * 1971-11-19 1974-12-17 Int Standard Electric Corp Electronic hybrid circuit for two-wire to four-wire interconnection
US4500755A (en) * 1981-11-18 1985-02-19 Northern Telecom Limited Electric hybrid circuits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855430A (en) * 1971-11-19 1974-12-17 Int Standard Electric Corp Electronic hybrid circuit for two-wire to four-wire interconnection
US4500755A (en) * 1981-11-18 1985-02-19 Northern Telecom Limited Electric hybrid circuits

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