JPS5630308A - Voltage control variable attenuator - Google Patents

Voltage control variable attenuator

Info

Publication number
JPS5630308A
JPS5630308A JP10632879A JP10632879A JPS5630308A JP S5630308 A JPS5630308 A JP S5630308A JP 10632879 A JP10632879 A JP 10632879A JP 10632879 A JP10632879 A JP 10632879A JP S5630308 A JPS5630308 A JP S5630308A
Authority
JP
Japan
Prior art keywords
negative resistance
diodes
input terminals
terminals
resistance
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
JP10632879A
Other languages
Japanese (ja)
Inventor
Takehide Takemura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10632879A priority Critical patent/JPS5630308A/en
Publication of JPS5630308A publication Critical patent/JPS5630308A/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
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To obtain a voltage control variable attenuator of high performance by canceling the unneeded resistance component of a base-side resistance by a negative resistance and by eliminating an influence of an electric current amplification factor not by a transistor but by a diode. CONSTITUTION:Amplifiers 16 and 17 with negative resistance provided, using inverted input terminals as negative resistance terminals, provide feedback from output terminals to uninverted input terminals by way of resistances 22 and 23. Diodes 18 and 19, even in electric characteristics, have internal resistances. To cancel those internal resistances, diodes 18 and 19 are connected at their anodes to negative resistance input terminals of amplifiers 20 and 21. Varying voltage Vc applied to amplifier 17 of this circuit varies biases of diodes 18 and 19, attenuating output voltage VO developed at the output terminal of amplifier 16.
JP10632879A 1979-08-20 1979-08-20 Voltage control variable attenuator Pending JPS5630308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10632879A JPS5630308A (en) 1979-08-20 1979-08-20 Voltage control variable attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10632879A JPS5630308A (en) 1979-08-20 1979-08-20 Voltage control variable attenuator

Publications (1)

Publication Number Publication Date
JPS5630308A true JPS5630308A (en) 1981-03-26

Family

ID=14430835

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10632879A Pending JPS5630308A (en) 1979-08-20 1979-08-20 Voltage control variable attenuator

Country Status (1)

Country Link
JP (1) JPS5630308A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6191213A (en) * 1984-10-12 1986-05-09 Bridgestone Corp Production of bitumen foam or bitumen elastomer
JPS6271165U (en) * 1985-10-24 1987-05-07
JPH0566777U (en) * 1992-02-21 1993-09-03 日本ビクター株式会社 Coin sorter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6191213A (en) * 1984-10-12 1986-05-09 Bridgestone Corp Production of bitumen foam or bitumen elastomer
JPS6271165U (en) * 1985-10-24 1987-05-07
JPH0566777U (en) * 1992-02-21 1993-09-03 日本ビクター株式会社 Coin sorter

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