FR2403690A1 - Active dipole gyrator for telephone line - uses transistor with base coupled to output of operational amplifier - Google Patents

Active dipole gyrator for telephone line - uses transistor with base coupled to output of operational amplifier

Info

Publication number
FR2403690A1
FR2403690A1 FR7727764A FR7727764A FR2403690A1 FR 2403690 A1 FR2403690 A1 FR 2403690A1 FR 7727764 A FR7727764 A FR 7727764A FR 7727764 A FR7727764 A FR 7727764A FR 2403690 A1 FR2403690 A1 FR 2403690A1
Authority
FR
France
Prior art keywords
gyrator
coupled
output
telephone line
operational amplifier
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.)
Granted
Application number
FR7727764A
Other languages
French (fr)
Other versions
FR2403690B1 (en
Inventor
Daniel Michel Auguste Fe Bolus
Jean-Pierre Chevillon
Jean-Charles Comte
Pierre Denis Paul Philippe
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.)
Laboratoire Central de Telecommunications SA
Original Assignee
Laboratoire Central de Telecommunications SA
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 Laboratoire Central de Telecommunications SA filed Critical Laboratoire Central de Telecommunications SA
Priority to FR7727764A priority Critical patent/FR2403690A1/en
Publication of FR2403690A1 publication Critical patent/FR2403690A1/en
Application granted granted Critical
Publication of FR2403690B1 publication Critical patent/FR2403690B1/fr
Granted legal-status Critical Current

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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/40—Impedance converters
    • H03H11/42—Gyrators

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

The dipole gyrator, exhibits a high impedance for AC current and a low resistance to DC current. The gyrator is placed in each supply branch to a telephone line, to reduce coupling between different lines coupled to the same supply. It uses a transistor (T) as the active element, whose collector is coupled directly to one terminal (A) and its emitter coupled via a resistor to another terminal (A'). The transistor base is coupled to the output of an operational amplifier (OP). The non-inverting input (V1) of the amplifier (OP) is connected to the first terminal (A) via a resistor (RB) and to the second terminal (A') via a resistor (RP) and capacitor (C) in parallel. The inverting input (V2) of the amplifier (OP) is coupled to the transistor emitter.
FR7727764A 1977-09-14 1977-09-14 Active dipole gyrator for telephone line - uses transistor with base coupled to output of operational amplifier Granted FR2403690A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7727764A FR2403690A1 (en) 1977-09-14 1977-09-14 Active dipole gyrator for telephone line - uses transistor with base coupled to output of operational amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7727764A FR2403690A1 (en) 1977-09-14 1977-09-14 Active dipole gyrator for telephone line - uses transistor with base coupled to output of operational amplifier

Publications (2)

Publication Number Publication Date
FR2403690A1 true FR2403690A1 (en) 1979-04-13
FR2403690B1 FR2403690B1 (en) 1984-04-20

Family

ID=9195388

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7727764A Granted FR2403690A1 (en) 1977-09-14 1977-09-14 Active dipole gyrator for telephone line - uses transistor with base coupled to output of operational amplifier

Country Status (1)

Country Link
FR (1) FR2403690A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0109705A1 (en) * 1982-11-12 1984-05-30 Koninklijke Philips Electronics N.V. Subscriber circuit for a telephone network
WO2000070857A1 (en) * 1999-05-14 2000-11-23 Conexant Systems, Inc. Electronic inductor with transmit signal telephone line driver
WO2000070856A1 (en) * 1999-05-14 2000-11-23 Conexant Systems, Inc. Telephone line interface circuit with intelligent line current and voltage control

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968773A (en) * 1959-12-17 1961-01-17 Bell Telephone Labor Inc Active one-port network

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968773A (en) * 1959-12-17 1961-01-17 Bell Telephone Labor Inc Active one-port network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/75 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0109705A1 (en) * 1982-11-12 1984-05-30 Koninklijke Philips Electronics N.V. Subscriber circuit for a telephone network
WO2000070857A1 (en) * 1999-05-14 2000-11-23 Conexant Systems, Inc. Electronic inductor with transmit signal telephone line driver
WO2000070856A1 (en) * 1999-05-14 2000-11-23 Conexant Systems, Inc. Telephone line interface circuit with intelligent line current and voltage control
US6584196B1 (en) 1999-05-14 2003-06-24 Conexant Systems, Inc. Electronic inductor with transmit signal telephone line driver
US6731749B1 (en) 1999-05-14 2004-05-04 Conexant Systems, Inc. Telephone line interface circuit with intelligent line current and voltage control
US7031462B2 (en) 1999-05-14 2006-04-18 Silicon Laboratories, Inc. Electronic inductor with transmit signal telephone line driver

Also Published As

Publication number Publication date
FR2403690B1 (en) 1984-04-20

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Legal Events

Date Code Title Description
ST Notification of lapse