JPS5762609A - Gain control amplifier - Google Patents

Gain control amplifier

Info

Publication number
JPS5762609A
JPS5762609A JP13917380A JP13917380A JPS5762609A JP S5762609 A JPS5762609 A JP S5762609A JP 13917380 A JP13917380 A JP 13917380A JP 13917380 A JP13917380 A JP 13917380A JP S5762609 A JPS5762609 A JP S5762609A
Authority
JP
Japan
Prior art keywords
detector
level
output
range
variable attenuator
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
JP13917380A
Other languages
Japanese (ja)
Inventor
Shusaku Sasaki
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 JP13917380A priority Critical patent/JPS5762609A/en
Publication of JPS5762609A publication Critical patent/JPS5762609A/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 without distortion of the input signal
    • 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

Abstract

PURPOSE:To set an output level in a range sufficiently wider than the operation level range of a detector and to make a detector input level constant to reduce the temperature fluctuation, by providing a variable attenuator between a coupling circuit and the detector to change the attenuation quantity in accordance with the output set level. CONSTITUTION:A part of the output of an amplifier 3 is taken out by a coupling circuit 5 and is inputted to a detector 6 through a variable attenuator 11. The output of the detector is compared with a reference voltage and is amplified in 7 and is applied to a variable attenuator 2. By this constitution, since the input level of the detector 6 is held in a narrow range when the attenuation quantity of the variable attenuator 11 is changed in accordance with the output set level of a terminal 9, the output level is set in a range wider than operation level range of the detector 6. By making the detector input level constant, temperature fluctuation is made slight.
JP13917380A 1980-10-03 1980-10-03 Gain control amplifier Pending JPS5762609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13917380A JPS5762609A (en) 1980-10-03 1980-10-03 Gain control amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13917380A JPS5762609A (en) 1980-10-03 1980-10-03 Gain control amplifier

Publications (1)

Publication Number Publication Date
JPS5762609A true JPS5762609A (en) 1982-04-15

Family

ID=15239272

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13917380A Pending JPS5762609A (en) 1980-10-03 1980-10-03 Gain control amplifier

Country Status (1)

Country Link
JP (1) JPS5762609A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5208550A (en) * 1991-04-16 1993-05-04 Mitsubishi Denki Kabushiki Kaisha Radio-frequency power amplifier device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5208550A (en) * 1991-04-16 1993-05-04 Mitsubishi Denki Kabushiki Kaisha Radio-frequency power amplifier device

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