JPS57152762A - Dc constant current supplying circuit with unsaturated current inverting function - Google Patents

Dc constant current supplying circuit with unsaturated current inverting function

Info

Publication number
JPS57152762A
JPS57152762A JP3851581A JP3851581A JPS57152762A JP S57152762 A JPS57152762 A JP S57152762A JP 3851581 A JP3851581 A JP 3851581A JP 3851581 A JP3851581 A JP 3851581A JP S57152762 A JPS57152762 A JP S57152762A
Authority
JP
Japan
Prior art keywords
current
constant
trs
output terminal
supplying circuit
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
JP3851581A
Other languages
Japanese (ja)
Inventor
Hiroshi Sunayama
Hiroshi Ogasawara
Kazuhiro Yoneda
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP3851581A priority Critical patent/JPS57152762A/en
Publication of JPS57152762A publication Critical patent/JPS57152762A/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)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To make a DC loop current constant and make the impedance of a current supplying circuit high, by using one transistor switch as a constant current circuit and operating the other transistor switch in the calss ''A''. CONSTITUTION:When level ''1'' is inputted to an input terminal (c), transistors TRs Tr12, Tr10, Tr5, and Tr6 are turned on, and TRs Q6 and Q7 for current inverting switch are turned on, and a current is flowed from an output terminal (a) to an output terminal (b), and this current is limited to a constant value. Meanwhile, since TRs Tr6 and Q7 are operated in the class ''a'', impedances are high sufficiently. When level ''O'' is inputted to the input terminal (c), these TRs are turned off, and a current is flowed from the output terminal (b) to the output terminal (a). In this case, the current is constant also, and a TR Q8 for current inverting switch is operated in the class ''a'', and therefore, the impedance is high sufficiently.
JP3851581A 1981-03-17 1981-03-17 Dc constant current supplying circuit with unsaturated current inverting function Pending JPS57152762A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3851581A JPS57152762A (en) 1981-03-17 1981-03-17 Dc constant current supplying circuit with unsaturated current inverting function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3851581A JPS57152762A (en) 1981-03-17 1981-03-17 Dc constant current supplying circuit with unsaturated current inverting function

Publications (1)

Publication Number Publication Date
JPS57152762A true JPS57152762A (en) 1982-09-21

Family

ID=12527402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3851581A Pending JPS57152762A (en) 1981-03-17 1981-03-17 Dc constant current supplying circuit with unsaturated current inverting function

Country Status (1)

Country Link
JP (1) JPS57152762A (en)

Similar Documents

Publication Publication Date Title
JPS5490941A (en) Driving circuit of tristate type
JPS5644208A (en) Amplifier
JPS57207405A (en) Broad band negative feedback amplifying circuit
JPS6417510A (en) Btl power amplifier circuit
CH612570GA3 (en) Oscillator with complementarily connected transistor amplifier working in linear operating mode
JPS6431258A (en) Microprocessor
JPS57152762A (en) Dc constant current supplying circuit with unsaturated current inverting function
JPS5542415A (en) Emphasis/de-emphasis circuit
JPS5544238A (en) Signal switching circuit
EP0346020A3 (en) Drive amplifier circuit
GB1520078A (en) Integrated mis driver stage
JPS6449423A (en) Complementary metal- oxide-semiconductor circuit
JPS54111261A (en) Signal switching circuit
GB2012521A (en) Feed bridge for a telephone line
JPS64806A (en) Power amplifier circuit device
EP0181752A3 (en) Extended range amplifier circuit
JPS55135408A (en) Integrated circuit for pre-emphasis
JPS54111260A (en) Level shift circuit
JPS56107638A (en) Current switch circuit
JPS57162837A (en) Inverter circuit
JPS6432719A (en) Output device for semiconductor integrated circuit
JPS54152936A (en) Output buffer circuit
JPS544309A (en) Driving circuit of direct current motor
JPS5568729A (en) Input circuit with input level decision
JPS56162539A (en) Signal-line driving circuit