[go: up one dir, main page]

JPS5671338A - Conversion circuit of two/four wires - Google Patents

Conversion circuit of two/four wires

Info

Publication number
JPS5671338A
JPS5671338A JP14742179A JP14742179A JPS5671338A JP S5671338 A JPS5671338 A JP S5671338A JP 14742179 A JP14742179 A JP 14742179A JP 14742179 A JP14742179 A JP 14742179A JP S5671338 A JPS5671338 A JP S5671338A
Authority
JP
Japan
Prior art keywords
wire side
output
amplifier
terminal pair
impedance
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
JP14742179A
Other languages
Japanese (ja)
Inventor
Toshihisa Yoshida
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 JP14742179A priority Critical patent/JPS5671338A/en
Publication of JPS5671338A publication Critical patent/JPS5671338A/en
Pending 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

Landscapes

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

Abstract

PURPOSE:To avoid the input signal at 4-wire side from being flowed to the output of 4-wire side, even if the impedance at the 2-wire side is fluctuated, by using an amplifier of low output impedance, amplifier of high output impedance and inversion amplifier. CONSTITUTION:When the signal voltage at 2-wire side is fed to a terminal pair 202, it is fed to a resistance 201 and output to the output terminal pair 222 at 4-wire side via an operational amplifier 203, low output impedance operational amplifier 214, and operational amplifier 220 for addition. A voltage fed to the input terminal pair 223 at 4-wire side is output to the terminal pair 202 at 2-wire side via an operational amplifier 200. On the other hand, the signal from the terminal pair 223 is not output to the terminal pair 222, because the signal via a transistor 205 of high output impedance and an amplifier 214, and the signal inverted at an inverting operational amplifier 216, are added at the amplifier 220 and cancelled each other. Accordingly, even if the impedance 224 at 2-wire side is fluctuated, the input signal at 4-wire side is avoided from being flowed to the output at 4-wire side.
JP14742179A 1979-11-14 1979-11-14 Conversion circuit of two/four wires Pending JPS5671338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14742179A JPS5671338A (en) 1979-11-14 1979-11-14 Conversion circuit of two/four wires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14742179A JPS5671338A (en) 1979-11-14 1979-11-14 Conversion circuit of two/four wires

Publications (1)

Publication Number Publication Date
JPS5671338A true JPS5671338A (en) 1981-06-13

Family

ID=15429925

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14742179A Pending JPS5671338A (en) 1979-11-14 1979-11-14 Conversion circuit of two/four wires

Country Status (1)

Country Link
JP (1) JPS5671338A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834632A (en) * 1981-08-24 1983-03-01 Nec Corp Two-wire, four-wire conversion circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834632A (en) * 1981-08-24 1983-03-01 Nec Corp Two-wire, four-wire conversion circuit

Similar Documents

Publication Publication Date Title
JPS5784149A (en) Semiconductor integrated circuit device
GB1257490A (en)
JPS5671338A (en) Conversion circuit of two/four wires
JPS5261945A (en) Transistor circuit
JPS546443A (en) Voltage control oscillation circuit
JPS5260544A (en) Signal converter circuit
JPS5323291A (en) Voltage converter circuit
JPS5737910A (en) Negative feedback amplifier
JPS5411458A (en) Comparison circuit
JPS53138261A (en) Integrated circuit device
JPS5436156A (en) Hybrid junction circuit
JPS5350644A (en) Active two terminal impedance circuit
JPS5398763A (en) Amplifier unit
JPS5297614A (en) Control circuit
JPS53108356A (en) Active circuit
JPS5466053A (en) Balance-unbalance converter
JPS5371557A (en) Am demodulating circuit
JPS6453612A (en) Amplifier
JPS5718112A (en) Current amplifier
ES487172A1 (en) Circuit arrangement for transferring a signal
JPS5661868A (en) Contour compensating circuit for picture signal
JPS5341963A (en) Negative feedback amplifier circuit
JPS5294054A (en) Differential amplifier
JPS5627518A (en) Amplifier
JPS547557A (en) Constant current circuit