JPS5599874A - Communication current supply circuit - Google Patents

Communication current supply circuit

Info

Publication number
JPS5599874A
JPS5599874A JP694479A JP694479A JPS5599874A JP S5599874 A JPS5599874 A JP S5599874A JP 694479 A JP694479 A JP 694479A JP 694479 A JP694479 A JP 694479A JP S5599874 A JPS5599874 A JP S5599874A
Authority
JP
Japan
Prior art keywords
resistor
terminals
circuit
capacitor
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.)
Pending
Application number
JP694479A
Other languages
Japanese (ja)
Inventor
Masahiko Ono
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP694479A priority Critical patent/JPS5599874A/en
Publication of JPS5599874A publication Critical patent/JPS5599874A/en
Pending 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
    • H04M19/005—Feeding arrangements without the use of line transformers

Landscapes

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

Abstract

PURPOSE:To make small the unit size and to increase the reliability, by making easy circuit integration and the improvement of characteristics, through the use of operational amplifier for the communication current supply circuit. CONSTITUTION:The terminals 1, 2 connected to a pair of telephone lines and the terminals 3, 4 connected to the power supply or ground are provided, and to the electronic circuit connected between the terminals 1 and 3, the series connection between the parallel circuit of the first resistor 7 and the first capacitor 21 and the parallel circuit of the second resistor 5 and the second capacitor 19 are connected. Further, to the junction of the parallel circuits, one input terminal of the operational amplifier 15 is connected via the third resistor 13, and the output of the amplifier 15 is connected to the base of the transistor Tr9. The emitter of Tr9 is connected to another input of the amplifier 15 via the fourth resistor 17 and connected to the terminal 3 via the resistor 11, and the collector is connected to the terminal 1. Further, the operational amplifier 16 of the similar circuit constitution is located between the terminals 2 and 4, the amplifiers 15, 16 are connected by the capacitor 23 to increase the characteristics by increasing the differential AC impedance between the terminals 1, 3 and 2, 4.
JP694479A 1979-01-23 1979-01-23 Communication current supply circuit Pending JPS5599874A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP694479A JPS5599874A (en) 1979-01-23 1979-01-23 Communication current supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP694479A JPS5599874A (en) 1979-01-23 1979-01-23 Communication current supply circuit

Publications (1)

Publication Number Publication Date
JPS5599874A true JPS5599874A (en) 1980-07-30

Family

ID=11652341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP694479A Pending JPS5599874A (en) 1979-01-23 1979-01-23 Communication current supply circuit

Country Status (1)

Country Link
JP (1) JPS5599874A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5742263A (en) * 1980-08-27 1982-03-09 Fujitsu Ltd Power feeding and two/four wire conversion system
US4982422A (en) * 1988-09-19 1991-01-01 Fujitsu Limited Terminating circuit in a battery feed circuit of an electronic exchange system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5742263A (en) * 1980-08-27 1982-03-09 Fujitsu Ltd Power feeding and two/four wire conversion system
JPS6230546B2 (en) * 1980-08-27 1987-07-02 Fujitsu Ltd
US4982422A (en) * 1988-09-19 1991-01-01 Fujitsu Limited Terminating circuit in a battery feed circuit of an electronic exchange system

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