JPS5564420A - Variable impedance circuit - Google Patents

Variable impedance circuit

Info

Publication number
JPS5564420A
JPS5564420A JP13824578A JP13824578A JPS5564420A JP S5564420 A JPS5564420 A JP S5564420A JP 13824578 A JP13824578 A JP 13824578A JP 13824578 A JP13824578 A JP 13824578A JP S5564420 A JPS5564420 A JP S5564420A
Authority
JP
Japan
Prior art keywords
impedance
current sources
circuit
couple
terminal
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
JP13824578A
Other languages
Japanese (ja)
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 JP13824578A priority Critical patent/JPS5564420A/en
Publication of JPS5564420A publication Critical patent/JPS5564420A/en
Pending 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

  • 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:Current sources 12 and 22 are those whose output currents are controlled by control voltages VC1 and VC2 applied to control terminals 3a and 3b respectively and current sources 11 and 21 supply currents a half as much as those of current sources 12 and 22. In variable resistance elements R1 and R2, collectors of a couple of transistors Q12 and Q21 are connected to their bases and Q11 and Q22 are not connected together. Viewing R1 and R2 from terminal 1, R1 is high in impedance because of a reverse PN junction and R2 has impedance (r2). Further, R2 is high in impedance and R1 has a value of (r1) being viewed from terminal 2. Circuit R can therefore be considered a reverseparallel-connection circuit of R1 and R2 with a connected voltage follower and a ratio of (r1) to (r2) becomes equal to that of IC1 to IC2.
JP13824578A 1978-11-09 1978-11-09 Variable impedance circuit Pending JPS5564420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13824578A JPS5564420A (en) 1978-11-09 1978-11-09 Variable impedance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13824578A JPS5564420A (en) 1978-11-09 1978-11-09 Variable impedance circuit

Publications (1)

Publication Number Publication Date
JPS5564420A true JPS5564420A (en) 1980-05-15

Family

ID=15217456

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13824578A Pending JPS5564420A (en) 1978-11-09 1978-11-09 Variable impedance circuit

Country Status (1)

Country Link
JP (1) JPS5564420A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964906A (en) * 1982-10-05 1984-04-13 Victor Co Of Japan Ltd Impedance switching circuit
JPS5964907A (en) * 1982-10-05 1984-04-13 Victor Co Of Japan Ltd Impedance switching circuit
JPS59117815A (en) * 1982-12-25 1984-07-07 Nippon Gakki Seizo Kk Electrical resistance control circuit
JPS61145920A (en) * 1984-12-17 1986-07-03 アドバンスト・マイクロ・デイバイシズ・インコーポレーテツド Apparatus having controllable effective resistance

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964906A (en) * 1982-10-05 1984-04-13 Victor Co Of Japan Ltd Impedance switching circuit
JPS5964907A (en) * 1982-10-05 1984-04-13 Victor Co Of Japan Ltd Impedance switching circuit
JPS59117815A (en) * 1982-12-25 1984-07-07 Nippon Gakki Seizo Kk Electrical resistance control circuit
JPH0344455B2 (en) * 1982-12-25 1991-07-08 Yamaha Corp
JPS61145920A (en) * 1984-12-17 1986-07-03 アドバンスト・マイクロ・デイバイシズ・インコーポレーテツド Apparatus having controllable effective resistance

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