JPS5762608A - Gain control amplifier - Google Patents

Gain control amplifier

Info

Publication number
JPS5762608A
JPS5762608A JP13917280A JP13917280A JPS5762608A JP S5762608 A JPS5762608 A JP S5762608A JP 13917280 A JP13917280 A JP 13917280A JP 13917280 A JP13917280 A JP 13917280A JP S5762608 A JPS5762608 A JP S5762608A
Authority
JP
Japan
Prior art keywords
output
level
amplifier
detector
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
JP13917280A
Other languages
Japanese (ja)
Inventor
Yoshiteru Saito
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 JP13917280A priority Critical patent/JPS5762608A/en
Publication of JPS5762608A publication Critical patent/JPS5762608A/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
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable

Abstract

PURPOSE:To set an output level in a wide range and to make the fluctuation due to temperature slight, by taking out a part of the output of an amplifier, whose gain is controlled, by a variable capacity or a variable resistance. CONSTITUTION:The output of an amplifier 3 is led to not only a terminal 9 but also a detector 6 through a variable capacity element 11. When the capacity 11 is reduced, the output of the amplifier is almost led to the terminal 9 and is set to a high level; and when the capacity 11 is increased, the output is set to a low level to increae the output to the detector 6 side. At this time, the matching condition for the output level of the terminal 9 is shifted from that for components absorbed to the detector 6 side from the output level of the amplifier 3, and the output level of the terminal 9 is reduced by components reflected to the amplifier, however, the attenuation quantity is small. Consequently, reduction of a maximum gain is small. Further, since the branching output is increased, the detection input level can be high, and an output level is st in a range wider than the operation level of the detector 6. When a variable resistance element 20 is used, the output level becomes slightly higher due to loss.
JP13917280A 1980-10-03 1980-10-03 Gain control amplifier Pending JPS5762608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13917280A JPS5762608A (en) 1980-10-03 1980-10-03 Gain control amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13917280A JPS5762608A (en) 1980-10-03 1980-10-03 Gain control amplifier

Publications (1)

Publication Number Publication Date
JPS5762608A true JPS5762608A (en) 1982-04-15

Family

ID=15239248

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13917280A Pending JPS5762608A (en) 1980-10-03 1980-10-03 Gain control amplifier

Country Status (1)

Country Link
JP (1) JPS5762608A (en)

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