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JPS56131215A - Tuner - Google Patents

Tuner

Info

Publication number
JPS56131215A
JPS56131215A JP3447180A JP3447180A JPS56131215A JP S56131215 A JPS56131215 A JP S56131215A JP 3447180 A JP3447180 A JP 3447180A JP 3447180 A JP3447180 A JP 3447180A JP S56131215 A JPS56131215 A JP S56131215A
Authority
JP
Japan
Prior art keywords
amplifier
agc
radio frequency
range
mixer
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
JP3447180A
Other languages
Japanese (ja)
Inventor
Shuji Sakamoto
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP3447180A priority Critical patent/JPS56131215A/en
Publication of JPS56131215A publication Critical patent/JPS56131215A/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
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages

Landscapes

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

Abstract

PURPOSE:To enable a tuner itself to obtain a sufficient range of received electric field intensity, by providing a variable impedance element, controlled by a gain control signal, in the signal path extending from a radio frequency amplifier to an intermediate frequency output terminal. CONSTITUTION:A received signal supplied to input terminal 4 is selected and amplified by radio frequency circuit 5 including radio frequency amplifier 6 and supplied to mixer 7. Between this mixer 7 and output terminal 10, variable impedance means 9 is provided. So that the magnitude of the received signal will be carried in the same direction with the gain control of amplifier 6 with an AGC signal supplied from terminal 11 to amplifier 6, the means 9 varies its impedance value. Thus, AGC is exercised by both amplifier 6 and means 9 to expand the range of AGC, so that the range of the intensity of receivable electric fields can be expanded.
JP3447180A 1980-03-17 1980-03-17 Tuner Pending JPS56131215A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3447180A JPS56131215A (en) 1980-03-17 1980-03-17 Tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3447180A JPS56131215A (en) 1980-03-17 1980-03-17 Tuner

Publications (1)

Publication Number Publication Date
JPS56131215A true JPS56131215A (en) 1981-10-14

Family

ID=12415159

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3447180A Pending JPS56131215A (en) 1980-03-17 1980-03-17 Tuner

Country Status (1)

Country Link
JP (1) JPS56131215A (en)

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