JPS54117659A - High frequency gain control circuit - Google Patents

High frequency gain control circuit

Info

Publication number
JPS54117659A
JPS54117659A JP2434378A JP2434378A JPS54117659A JP S54117659 A JPS54117659 A JP S54117659A JP 2434378 A JP2434378 A JP 2434378A JP 2434378 A JP2434378 A JP 2434378A JP S54117659 A JPS54117659 A JP S54117659A
Authority
JP
Japan
Prior art keywords
gain control
circuits
output
amplifier circuits
high frequency
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
JP2434378A
Other languages
Japanese (ja)
Inventor
Norio Takahashi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2434378A priority Critical patent/JPS54117659A/en
Publication of JPS54117659A publication Critical patent/JPS54117659A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make it possible to improve a noise factor by dividing an amplifier performing the automatic gain control into multi-stage amplifier circuits and connecting them in multiple stages and providing detectors at outputs of amplifier circuits respectively and performing independently the automatic gain control by the output of this detector. CONSTITUTION:The high frequency amplifier circuit performing the automatic gain control is divided into circuits which are provided with multi-stage amplifier circuits A1 to A3 and attenuators ATT1 to ATT3, and they are connected in multiple stages. Then, detectors X1 to X3 are provided at output terminals A, B and C of these circuits respectively, and the attenuation quantity of attenuators ATT1 to ATT3 which attenuate outputs of amplifier circuits A1 to A3 respectively is controlled by the output of detectors X1 to X3. Then, the attenuation quantity of attenuators ATT1 to ATT3 is controlled correspondingly to the noise factor of the output of amplifier circuits A1 to A3, thereby improving the noise factor as the whole.
JP2434378A 1978-03-03 1978-03-03 High frequency gain control circuit Pending JPS54117659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2434378A JPS54117659A (en) 1978-03-03 1978-03-03 High frequency gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2434378A JPS54117659A (en) 1978-03-03 1978-03-03 High frequency gain control circuit

Publications (1)

Publication Number Publication Date
JPS54117659A true JPS54117659A (en) 1979-09-12

Family

ID=12135530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2434378A Pending JPS54117659A (en) 1978-03-03 1978-03-03 High frequency gain control circuit

Country Status (1)

Country Link
JP (1) JPS54117659A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5999877A (en) * 1982-11-29 1984-06-08 Maspro Denkoh Corp Agc system of receiving amplifier
US4560949A (en) * 1982-09-27 1985-12-24 Rockwell International Corporation High speed AGC circuit
EP0410629A2 (en) * 1989-07-26 1991-01-30 Nortel Networks Corporation Automatic signal parameter control
EP0600637A1 (en) * 1992-12-01 1994-06-08 Hughes Aircraft Company System for distributed digital receiver gain control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560949A (en) * 1982-09-27 1985-12-24 Rockwell International Corporation High speed AGC circuit
JPS5999877A (en) * 1982-11-29 1984-06-08 Maspro Denkoh Corp Agc system of receiving amplifier
EP0410629A2 (en) * 1989-07-26 1991-01-30 Nortel Networks Corporation Automatic signal parameter control
EP0600637A1 (en) * 1992-12-01 1994-06-08 Hughes Aircraft Company System for distributed digital receiver gain control

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