JPS5564419A - Variable impedance circuit - Google Patents

Variable impedance circuit

Info

Publication number
JPS5564419A
JPS5564419A JP13824378A JP13824378A JPS5564419A JP S5564419 A JPS5564419 A JP S5564419A JP 13824378 A JP13824378 A JP 13824378A JP 13824378 A JP13824378 A JP 13824378A JP S5564419 A JPS5564419 A JP S5564419A
Authority
JP
Japan
Prior art keywords
currents
couple
variable impedance
converter
impedance 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.)
Granted
Application number
JP13824378A
Other languages
Japanese (ja)
Other versions
JPS61733B2 (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 JP13824378A priority Critical patent/JPS5564419A/en
Priority to US06/018,665 priority patent/US4288707A/en
Priority to EP79100751A priority patent/EP0004099B1/en
Priority to DE7979100751T priority patent/DE2962940D1/en
Publication of JPS5564419A publication Critical patent/JPS5564419A/en
Publication of JPS61733B2 publication Critical patent/JPS61733B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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 of the amplifier
    • 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 of the amplifier in emitter-coupled or cascode amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks

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 a floating type variable impedance circuit by using a couple of differential transistors. CONSTITUTION:Input voltages V1 and V2 are applied to V-I converter 10 to obtain currents (i3) and (i4). Currents (i3) and (i4) flow through PN junction couple 25 in current amplifier 20 and voltages developed here are applied to respective bases of differential transistor couple 27. As a result, currents (i5) and (i6) flow to a couple of idfferential output terminals 23 and 24 of current amplifier 20, current sources 31 and 32 are constituted to supply currents a half as much as that of current source 28, when the transfer conductance of the V-I converter is denoted K1, currents (i5) and (i6) will be expressed by (3) and (4). Namely, conductance equivalent to K1.I2/I1 can be obtained between terminals 1 and 2 without reference to the earth voltage. In other words, floating type constitution is realized and a circuit can be obtained which provides various applications and the simplification of integration.
JP13824378A 1978-03-14 1978-11-09 Variable impedance circuit Granted JPS5564419A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP13824378A JPS5564419A (en) 1978-11-09 1978-11-09 Variable impedance circuit
US06/018,665 US4288707A (en) 1978-03-14 1979-03-08 Electrically variable impedance circuit
EP79100751A EP0004099B1 (en) 1978-03-14 1979-03-13 Electrically variable impedance circuit
DE7979100751T DE2962940D1 (en) 1978-03-14 1979-03-13 Electrically variable impedance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13824378A JPS5564419A (en) 1978-11-09 1978-11-09 Variable impedance circuit

Publications (2)

Publication Number Publication Date
JPS5564419A true JPS5564419A (en) 1980-05-15
JPS61733B2 JPS61733B2 (en) 1986-01-10

Family

ID=15217411

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13824378A Granted JPS5564419A (en) 1978-03-14 1978-11-09 Variable impedance circuit

Country Status (1)

Country Link
JP (1) JPS5564419A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0372709A (en) * 1988-10-25 1991-03-27 Matsushita Electric Ind Co Ltd Variable impedance circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0372709A (en) * 1988-10-25 1991-03-27 Matsushita Electric Ind Co Ltd Variable impedance circuit

Also Published As

Publication number Publication date
JPS61733B2 (en) 1986-01-10

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