JPS5564421A - Variable impedance circuit - Google Patents

Variable impedance circuit

Info

Publication number
JPS5564421A
JPS5564421A JP13824678A JP13824678A JPS5564421A JP S5564421 A JPS5564421 A JP S5564421A JP 13824678 A JP13824678 A JP 13824678A JP 13824678 A JP13824678 A JP 13824678A JP S5564421 A JPS5564421 A JP S5564421A
Authority
JP
Japan
Prior art keywords
current
voltage
circuit
variable impedance
currents
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
JP13824678A
Other languages
Japanese (ja)
Other versions
JPS6144409B2 (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 JP13824678A priority Critical patent/JPS5564421A/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 JPS5564421A publication Critical patent/JPS5564421A/en
Publication of JPS6144409B2 publication Critical patent/JPS6144409B2/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 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

Landscapes

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

Abstract

PURPOSE:To realize a floating type variable impedance circuit which can easily be integrated, by using a couple of differential transistors. CONSTITUTION:Input voltage V1, converted into a current by V-I converter 10, is converted intp a voltage by transistor Q21 in current amplifier 20 and then applied to the base of Q23. Current divider circuit 30 divides currents, to be flowed to Q23 and Q24, at desired ratio f(vc) by control voltage Vc. Therefore, relations between currents (i3) and (i4), and (i7) and (i8) are born without reference to the earth voltage and impedance between terminals 1 and 2 can be varied by controlling current division rate f(vc). Current divider circuit 30 is of structure hard to cause non-linearity and the gain of current amplifier 20 may be fixed, so that an excellent- linearity circuit can be obtained.
JP13824678A 1978-03-14 1978-11-09 Variable impedance circuit Granted JPS5564421A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP13824678A JPS5564421A (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
JP13824678A JPS5564421A (en) 1978-11-09 1978-11-09 Variable impedance circuit

Publications (2)

Publication Number Publication Date
JPS5564421A true JPS5564421A (en) 1980-05-15
JPS6144409B2 JPS6144409B2 (en) 1986-10-02

Family

ID=15217477

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13824678A Granted JPS5564421A (en) 1978-03-14 1978-11-09 Variable impedance circuit

Country Status (1)

Country Link
JP (1) JPS5564421A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5799810A (en) * 1980-12-12 1982-06-21 Matsushita Electric Ind Co Ltd Signal controller
JPS5910035A (en) * 1982-07-09 1984-01-19 Hitachi Ltd Variable impedance device
JPH0198308A (en) * 1987-10-09 1989-04-17 Matsushita Electric Ind Co Ltd Voltage controlled amplifier
US4990872A (en) * 1987-06-17 1991-02-05 Sanyo Electric Co., Ltd. Variable reactance circuit producing negative to positive varying reactance
JP2008072768A (en) * 2007-11-30 2008-03-27 Mitsubishi Electric Corp Variable resistance circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6371114U (en) * 1986-10-29 1988-05-13
JPH058252Y2 (en) * 1988-02-09 1993-03-02

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5799810A (en) * 1980-12-12 1982-06-21 Matsushita Electric Ind Co Ltd Signal controller
JPS5910035A (en) * 1982-07-09 1984-01-19 Hitachi Ltd Variable impedance device
JPH0572766B2 (en) * 1982-07-09 1993-10-13 Hitachi Ltd
US4990872A (en) * 1987-06-17 1991-02-05 Sanyo Electric Co., Ltd. Variable reactance circuit producing negative to positive varying reactance
JPH0198308A (en) * 1987-10-09 1989-04-17 Matsushita Electric Ind Co Ltd Voltage controlled amplifier
JP2008072768A (en) * 2007-11-30 2008-03-27 Mitsubishi Electric Corp Variable resistance circuit

Also Published As

Publication number Publication date
JPS6144409B2 (en) 1986-10-02

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