JPS5564418A - Variable impedance circuit - Google Patents

Variable impedance circuit

Info

Publication number
JPS5564418A
JPS5564418A JP13824278A JP13824278A JPS5564418A JP S5564418 A JPS5564418 A JP S5564418A JP 13824278 A JP13824278 A JP 13824278A JP 13824278 A JP13824278 A JP 13824278A JP S5564418 A JPS5564418 A JP S5564418A
Authority
JP
Japan
Prior art keywords
current
variable impedance
couple
input current
terminals
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
JP13824278A
Other languages
Japanese (ja)
Other versions
JPS61732B2 (en
Inventor
Masayuki Katakura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13824278A priority Critical patent/JPS5564418A/en
Publication of JPS5564418A publication Critical patent/JPS5564418A/en
Publication of JPS61732B2 publication Critical patent/JPS61732B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid-state elements
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid-state elements in emitter-coupled or cascode amplifiers

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Networks Using Active Elements (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To realize floating type variable impedance with excellent linearity by using a differential transistor couple. CONSTITUTION:A couple of differential transistors 10 are provided with constant current sources 11, 12 and 13, which supply currents at a ratio of 1:1:2. Connecting signal source 6 to terminal 1 flows input current (i1) through transistor Q11, allowing corresponding current ICto flow. At this time, current IC) flows out from constant current source 12 and output current (i2) equivalent to input current to input current (i1) is obtained. In this case, potential difference (vR) between terminals 1 and 2 is determined by the input current and IC and made unrelated to the earth potential. Therefore, a floating type variable impedance circuit is realized between terminals 1 and 2. In addition, it is possible to insert a couple of PN junctions between emitter electrodes of transistors Q11 and Q12 in order to obtain wide linearity.
JP13824278A 1978-11-09 1978-11-09 Variable impedance circuit Granted JPS5564418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13824278A JPS5564418A (en) 1978-11-09 1978-11-09 Variable impedance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13824278A JPS5564418A (en) 1978-11-09 1978-11-09 Variable impedance circuit

Publications (2)

Publication Number Publication Date
JPS5564418A true JPS5564418A (en) 1980-05-15
JPS61732B2 JPS61732B2 (en) 1986-01-10

Family

ID=15217388

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13824278A Granted JPS5564418A (en) 1978-11-09 1978-11-09 Variable impedance circuit

Country Status (1)

Country Link
JP (1) JPS5564418A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202618A (en) * 1982-05-08 1983-11-25 Toko Inc Variable impedance circuit
US5373243A (en) * 1991-09-26 1994-12-13 U.S. Philips Corporation Impedance transformation circuit with matched current sources

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62160522A (en) * 1986-01-09 1987-07-16 Akai Electric Co Ltd Starting circuit for microcomputer by key matrix input
JPS6312223U (en) * 1986-07-08 1988-01-27
JPH0421019A (en) * 1990-05-14 1992-01-24 Tamura Electric Works Ltd Key detecting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202618A (en) * 1982-05-08 1983-11-25 Toko Inc Variable impedance circuit
US5373243A (en) * 1991-09-26 1994-12-13 U.S. Philips Corporation Impedance transformation circuit with matched current sources

Also Published As

Publication number Publication date
JPS61732B2 (en) 1986-01-10

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