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JPS5478954A - Agc amplifier circuit - Google Patents

Agc amplifier circuit

Info

Publication number
JPS5478954A
JPS5478954A JP14622577A JP14622577A JPS5478954A JP S5478954 A JPS5478954 A JP S5478954A JP 14622577 A JP14622577 A JP 14622577A JP 14622577 A JP14622577 A JP 14622577A JP S5478954 A JPS5478954 A JP S5478954A
Authority
JP
Japan
Prior art keywords
agc
diodes
impedance
variable
attenuation
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
JP14622577A
Other languages
Japanese (ja)
Inventor
Hiroyuki Kobayashi
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 JP14622577A priority Critical patent/JPS5478954A/en
Publication of JPS5478954A publication Critical patent/JPS5478954A/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

  • Attenuators (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To establish the AGC amplifying circuit which can take wider control range, by providing the attenuation circuit of multicascade connection consisting of variable impedances at the input side of the amplifier and the means making variable the impedance depending on the output signal at the output side. CONSTITUTION:When the amplitude of the input signal is more than a certain amplitude, the AGC voltage fed to the terminal 19 is rapidly increased and the transistor Tr 18 is more and more easy to be conductive. The collector current of Tr18 is flowed to Tr16 and AGC diodes 14 and 23. The input signal is attenuated with the attenuation circuit consisting of the resistor 12 and diode 14 and that consisting of the resistor 20 and diode 23, and the diodes 14 and 23 act like variable impedance. The resistors 12 and 20 are taken as equal value R and the impedance of the diodes 14 and 20 is also equally selected, then the ratio of attenuation is expressed as r<2>/(R+r)<2> and AGC width W sufficiently broad can be obtained.
JP14622577A 1977-12-06 1977-12-06 Agc amplifier circuit Pending JPS5478954A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14622577A JPS5478954A (en) 1977-12-06 1977-12-06 Agc amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14622577A JPS5478954A (en) 1977-12-06 1977-12-06 Agc amplifier circuit

Publications (1)

Publication Number Publication Date
JPS5478954A true JPS5478954A (en) 1979-06-23

Family

ID=15402932

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14622577A Pending JPS5478954A (en) 1977-12-06 1977-12-06 Agc amplifier circuit

Country Status (1)

Country Link
JP (1) JPS5478954A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61253474A (en) * 1985-05-02 1986-11-11 Yokogawa Hewlett Packard Ltd Attenuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61253474A (en) * 1985-05-02 1986-11-11 Yokogawa Hewlett Packard Ltd Attenuator

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