JPS5484455A - Automatic gain control unit - Google Patents

Automatic gain control unit

Info

Publication number
JPS5484455A
JPS5484455A JP15220177A JP15220177A JPS5484455A JP S5484455 A JPS5484455 A JP S5484455A JP 15220177 A JP15220177 A JP 15220177A JP 15220177 A JP15220177 A JP 15220177A JP S5484455 A JPS5484455 A JP S5484455A
Authority
JP
Japan
Prior art keywords
diode
amplifier
trq
voltage
automatic
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.)
Granted
Application number
JP15220177A
Other languages
Japanese (ja)
Other versions
JPS5948563B2 (en
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 JP15220177A priority Critical patent/JPS5948563B2/en
Publication of JPS5484455A publication Critical patent/JPS5484455A/en
Publication of JPS5948563B2 publication Critical patent/JPS5948563B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE: To increase the range of the automatic voltage control by connecting the diode to the collector of the transistor for automatic volge control, supplying the voltage which varies according to the reception signals to the base of the Tr and then lowering the impedance of the amplifier via the Tr and the diode.
CONSTITUTION: Diode D1 is connected in series to the collector of automatic voltage control transistor Q2; the junction point of D1 and input signal tuning circuit L1 is connected to each high frequency and IF amplifier; and junction point P of D1 and TrQ2 is connected to the high frequency amplifier. At the same time, TrQ2 and D1 are connected to the circuit comprising resistance R5 plus diode D3 and D4 which supply the bias voltage to each signal amplifier, and the voltage which changes according to the reception signal input voltage detected through detecting diode D2 is applied to the base of TrQ2. Then TrQ2 and diode D1 are turned on at the reception signal input time to lower the impedance of the amplifier.
COPYRIGHT: (C)1979,JPO&Japio
JP15220177A 1977-12-17 1977-12-17 automatic gain adjustment device Expired JPS5948563B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15220177A JPS5948563B2 (en) 1977-12-17 1977-12-17 automatic gain adjustment device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15220177A JPS5948563B2 (en) 1977-12-17 1977-12-17 automatic gain adjustment device

Publications (2)

Publication Number Publication Date
JPS5484455A true JPS5484455A (en) 1979-07-05
JPS5948563B2 JPS5948563B2 (en) 1984-11-27

Family

ID=15535260

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15220177A Expired JPS5948563B2 (en) 1977-12-17 1977-12-17 automatic gain adjustment device

Country Status (1)

Country Link
JP (1) JPS5948563B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56140223U (en) * 1980-03-21 1981-10-23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56140223U (en) * 1980-03-21 1981-10-23

Also Published As

Publication number Publication date
JPS5948563B2 (en) 1984-11-27

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