JPS61199397A - Loop circuit for channel - Google Patents

Loop circuit for channel

Info

Publication number
JPS61199397A
JPS61199397A JP3962185A JP3962185A JPS61199397A JP S61199397 A JPS61199397 A JP S61199397A JP 3962185 A JP3962185 A JP 3962185A JP 3962185 A JP3962185 A JP 3962185A JP S61199397 A JPS61199397 A JP S61199397A
Authority
JP
Japan
Prior art keywords
voltage
transistor
current
loop circuit
limited
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
JP3962185A
Other languages
Japanese (ja)
Inventor
Shoichi Abe
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
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 filed Critical NEC Corp
Priority to JP3962185A priority Critical patent/JPS61199397A/en
Publication of JPS61199397A publication Critical patent/JPS61199397A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain a loop circuit with small power consumption regardless of the source voltage of the channel by limiting the value of current flowing through the lines to a prescribed value and less when the voltage between the lines is below a specified voltage and by releasing the limitation when the voltage once exceeds the specified voltage, and thereby maintaining an approximately constant resistance.
CONSTITUTION: In case the voltage between the signal line 100 and 200 rises, the base voltage of a transistor Q0 is limited by a reference diode ZD1, and the current of the transistor Q0 is also limited. That is, the loop circuit is limited in a state of the first limit-current. When a voltage lifting power source is connected between the signal lines 100 and 200 and the voltage between the two exceeds the specified value, a current flows through a reference diode ZD0 and a resistor R2, and a current is supplied to the base electrode of a transistor Q1 turning the transistor Q1 on. Consequently, the base voltage of the transistor Q0 is determined by resistors R0 and R1, and the current that flows through the transistor Q1. That is, the current flowing in the loop circuit is released from the limit.
COPYRIGHT: (C)1986,JPO&Japio
JP3962185A 1985-02-28 1985-02-28 Loop circuit for channel Pending JPS61199397A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3962185A JPS61199397A (en) 1985-02-28 1985-02-28 Loop circuit for channel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3962185A JPS61199397A (en) 1985-02-28 1985-02-28 Loop circuit for channel

Publications (1)

Publication Number Publication Date
JPS61199397A true JPS61199397A (en) 1986-09-03

Family

ID=12558177

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3962185A Pending JPS61199397A (en) 1985-02-28 1985-02-28 Loop circuit for channel

Country Status (1)

Country Link
JP (1) JPS61199397A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6436255A (en) * 1987-07-31 1989-02-07 Fujitsu Ltd Feeding circuit
JPH03248662A (en) * 1990-02-27 1991-11-06 Fujitsu Ltd Feeder circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6436255A (en) * 1987-07-31 1989-02-07 Fujitsu Ltd Feeding circuit
JPH03248662A (en) * 1990-02-27 1991-11-06 Fujitsu Ltd Feeder circuit
JP2656131B2 (en) * 1990-02-27 1997-09-24 富士通株式会社 Power supply circuit

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