JPS5464954A - Intermediate frequency circuit - Google Patents

Intermediate frequency circuit

Info

Publication number
JPS5464954A
JPS5464954A JP13182177A JP13182177A JPS5464954A JP S5464954 A JPS5464954 A JP S5464954A JP 13182177 A JP13182177 A JP 13182177A JP 13182177 A JP13182177 A JP 13182177A JP S5464954 A JPS5464954 A JP S5464954A
Authority
JP
Japan
Prior art keywords
trq
voltage
collector
amplifier
common
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
JP13182177A
Other languages
Japanese (ja)
Other versions
JPS5910608B2 (en
Inventor
Eizo Mori
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 JP13182177A priority Critical patent/JPS5910608B2/en
Publication of JPS5464954A publication Critical patent/JPS5464954A/en
Publication of JPS5910608B2 publication Critical patent/JPS5910608B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Amplifiers (AREA)
  • Superheterodyne Receivers (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE: To obtain a circuit which features both the AGC and DAGC functions and is easy to be integrated in the IF amplifier circuit common to AM and FM, by using the voltage between both ends of the collector load resistance of the transistor to supply the AGC voltage as the DAGC voltage.
CONSTITUTION: The common emitter of the IF differential amplifier, in which the emitters of 1st and 2nd transistor TrQ1 and Q2 are connected to each other in the IF amplifier circuit common to AM and FM, is connected to the collector of TrQ3 which constitutes the constant current source circuit. Then the emitter of TrQ5 using the AGC voltage as the base input is connectrd to load resistance r1 common to the emitter, and the collector of TrQ5 is connected to the power sources of high frequency amplifier and frequency converter circuits 1 and 2 via resistance R7. Thus, the current of TrQ5 is flown by the AGC voltage, lowering the gain of the amplifier consisting of TrQ1 and Q2. At the same time, the overlap voltage r1 of TrQ5 is used as the DAGC voltage of the AM high frequency and the frequency converter circuit. And switch SW1 is turned off in the case of the IF amplification of FM, and thus the collector current of TrQ5 is turned off.
COPYRIGHT: (C)1979,JPO&Japio
JP13182177A 1977-11-02 1977-11-02 intermediate frequency circuit Expired JPS5910608B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13182177A JPS5910608B2 (en) 1977-11-02 1977-11-02 intermediate frequency circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13182177A JPS5910608B2 (en) 1977-11-02 1977-11-02 intermediate frequency circuit

Publications (2)

Publication Number Publication Date
JPS5464954A true JPS5464954A (en) 1979-05-25
JPS5910608B2 JPS5910608B2 (en) 1984-03-10

Family

ID=15066878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13182177A Expired JPS5910608B2 (en) 1977-11-02 1977-11-02 intermediate frequency circuit

Country Status (1)

Country Link
JP (1) JPS5910608B2 (en)

Also Published As

Publication number Publication date
JPS5910608B2 (en) 1984-03-10

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