JPS5484456A - Automatic gain control unit - Google Patents

Automatic gain control unit

Info

Publication number
JPS5484456A
JPS5484456A JP15220277A JP15220277A JPS5484456A JP S5484456 A JPS5484456 A JP S5484456A JP 15220277 A JP15220277 A JP 15220277A JP 15220277 A JP15220277 A JP 15220277A JP S5484456 A JPS5484456 A JP S5484456A
Authority
JP
Japan
Prior art keywords
resistance
amplifier
trq
voltage control
automatic voltage
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
JP15220277A
Other languages
Japanese (ja)
Inventor
Yoshimi Ohashi
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 JP15220277A priority Critical patent/JPS5484456A/en
Publication of JPS5484456A publication Critical patent/JPS5484456A/en
Pending legal-status Critical Current

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  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE: To increase the range of the automatic voltage control by connecting the resistance to the collector of the automatic voltage control transistor, supplying the voltage varying according to the reception signals to the base of the Tr and then lowering the impedance of the amplifier via the Tr and the resistance.
CONSTITUTION: Resistance R1 is connected in series to the collector of automatic voltage control transistor Q2; junction point P of TrQ2 and R1 is connected to the input side of the high frequency amplifier; and the other end of R1 is connected to input tuning circuit L1 as well as to each amplifier. At the same time, resistance R2 and TrQ2 are connected to the circuit comprising resistance R4 plus diode D2 and D3 which supply the bias voltage to each amplifier, and furthermore the voltage varying according to the reception signal voltage detected by detecting diode D2 is supplied to the base of TrQ2. Thus, TrQ2 is made to conduct at the reception signal input time to lower the inpedance of the amplifier, increasing the automatic voltage control range.
COPYRIGHT: (C)1979,JPO&Japio
JP15220277A 1977-12-17 1977-12-17 Automatic gain control unit Pending JPS5484456A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15220277A JPS5484456A (en) 1977-12-17 1977-12-17 Automatic gain control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15220277A JPS5484456A (en) 1977-12-17 1977-12-17 Automatic gain control unit

Publications (1)

Publication Number Publication Date
JPS5484456A true JPS5484456A (en) 1979-07-05

Family

ID=15535282

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15220277A Pending JPS5484456A (en) 1977-12-17 1977-12-17 Automatic gain control unit

Country Status (1)

Country Link
JP (1) JPS5484456A (en)

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