ZA784547B - Unbalanced/balanced converter circuits - Google Patents

Unbalanced/balanced converter circuits

Info

Publication number
ZA784547B
ZA784547B ZA00784547A ZA784547A ZA784547B ZA 784547 B ZA784547 B ZA 784547B ZA 00784547 A ZA00784547 A ZA 00784547A ZA 784547 A ZA784547 A ZA 784547A ZA 784547 B ZA784547 B ZA 784547B
Authority
ZA
South Africa
Prior art keywords
unbalanced
converter circuits
balanced converter
balanced
circuits
Prior art date
Application number
ZA00784547A
Other languages
English (en)
Inventor
G Tattersall
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Publication of ZA784547B publication Critical patent/ZA784547B/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/32—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/42—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
    • 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
    • H04B1/583—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 using a bridge network

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Networks Using Active Elements (AREA)
ZA00784547A 1977-08-17 1978-08-10 Unbalanced/balanced converter circuits ZA784547B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3451077 1977-08-17

Publications (1)

Publication Number Publication Date
ZA784547B true ZA784547B (en) 1979-08-29

Family

ID=10366555

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00784547A ZA784547B (en) 1977-08-17 1978-08-10 Unbalanced/balanced converter circuits

Country Status (13)

Country Link
US (1) US4203009A (xx)
EP (1) EP0000990A1 (xx)
JP (1) JPS5452953A (xx)
AU (1) AU3891478A (xx)
BR (1) BR7805280A (xx)
DE (1) DE2857160A1 (xx)
FR (1) FR2426366A1 (xx)
GB (1) GB2003003B (xx)
IT (1) IT1105455B (xx)
NL (1) NL7815016A (xx)
PT (1) PT68425A (xx)
SE (1) SE7907125L (xx)
ZA (1) ZA784547B (xx)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7903665A (nl) * 1979-05-10 1980-11-12 Philips Nv Aansluitschakeling voor een telefoonlijn.
US4283604A (en) * 1979-06-04 1981-08-11 Tellabs, Inc. Current source circuits with common mode noise rejection
US4357494A (en) * 1979-06-04 1982-11-02 Tellabs, Inc. Impedance canceller circuit
US4322586A (en) * 1980-11-13 1982-03-30 Northern Telecom Limited Transformerless line interface circuit
US4465967A (en) * 1981-01-28 1984-08-14 Hitachi, Ltd. Current supply circuit
DE3237681C2 (de) * 1982-10-12 1986-03-27 Standard Elektrik Lorenz Ag, 7000 Stuttgart Speiseschaltung für einen veränderlichen Verbraucherwiderstand und mit unterschiedlich wirkendem Ausgangswiderstand
US4600811A (en) * 1982-12-28 1986-07-15 Nec Corporation Subscriber line interface circuit
US4465903A (en) * 1983-04-21 1984-08-14 Ixo, Inc. Electronic telephone interface circuit
JPS60141006A (ja) * 1983-12-28 1985-07-26 Nec Corp インピ−ダンス合成回路
JPS60157369A (ja) * 1984-01-26 1985-08-17 Iwatsu Electric Co Ltd 通話電流供給回路
US4706281A (en) * 1984-04-30 1987-11-10 American Telephone And Telegraph Company Dynamic impedance element for a battery feed circuit
US4554412A (en) * 1984-07-23 1985-11-19 At&T Information Systems Inc. Resistive line circuit
US4612417A (en) * 1984-07-27 1986-09-16 At&T Bell Laboratories Electronic battery feed circuit for telephone systems
US4618743A (en) * 1984-11-27 1986-10-21 Harris Corporation Monolithic transient protector
CA1231480A (en) * 1985-03-15 1988-01-12 John A. Barsellotti Constant current line circuit
US4866768A (en) * 1985-06-26 1989-09-12 Siemens Corporate Research & Support, Inc. Station line interface circuit for a telecommunication network
US4736415A (en) * 1985-07-05 1988-04-05 American Telephone And Telegraph Company Resistive line feed circuit
US4685130A (en) * 1985-08-29 1987-08-04 Gte Communication Systems Corporation Subscriber line circuit having an improved loop current supply circuit
US4979218A (en) * 1989-05-01 1990-12-18 Audio Teknology Incorporated Balanced output circuit
US5189697A (en) * 1990-04-30 1993-02-23 Northern Telecom Limited Line interface circuit
US5801749A (en) * 1995-12-13 1998-09-01 Sony Corporation Universal audio/video signal converter
EP1316196A2 (en) * 2000-09-06 2003-06-04 Polycom, Inc. System and method for diagnosing a pots port

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2157150A5 (xx) * 1971-10-20 1973-06-01 Labo Cent Telecommunicat
FR2254168A1 (en) * 1973-12-11 1975-07-04 Ass Ouvriers Instr Precision Telephone line supply device - is an active electronic device acting as resistance for direct current and high impedance for A.C.
US3955052A (en) * 1974-11-18 1976-05-04 Tadiran Israel Electronics Industries Ltd. Subscriber unit particularly useful for time-division-multiplex system
US4007335A (en) * 1975-11-12 1977-02-08 Bell Telephone Laboratories, Incorporated Telephone line battery feed circuit
CH599731A5 (xx) * 1976-03-02 1978-05-31 Ibm
US4041252A (en) * 1976-06-07 1977-08-09 North Electric Company Transformerless two-wire/four-wire hybrid with DC sourcing capability
DE2655005C3 (de) * 1976-12-02 1980-04-17 Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin Schaltungsanordnung für eine elektronische Teilnehmerspeisung
US4087647A (en) * 1977-05-25 1978-05-02 Bell Telephone Laboratories, Incorporated Circuit for supplying direct current to telephone station sets

Also Published As

Publication number Publication date
AU3891478A (en) 1980-02-21
DE2857160A1 (de) 1980-03-06
IT1105455B (it) 1985-11-04
US4203009A (en) 1980-05-13
FR2426366A1 (fr) 1979-12-14
JPS5452953A (en) 1979-04-25
IT7850750A0 (it) 1978-08-16
NL7815016A (nl) 1979-10-31
BR7805280A (pt) 1979-04-17
GB2003003A (en) 1979-02-28
GB2003003B (en) 1982-02-17
EP0000990A1 (en) 1979-03-07
PT68425A (en) 1978-09-01
SE7907125L (sv) 1979-08-27

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