JPS5521682A - Automatic gain control unit - Google Patents

Automatic gain control unit

Info

Publication number
JPS5521682A
JPS5521682A JP9531478A JP9531478A JPS5521682A JP S5521682 A JPS5521682 A JP S5521682A JP 9531478 A JP9531478 A JP 9531478A JP 9531478 A JP9531478 A JP 9531478A JP S5521682 A JPS5521682 A JP S5521682A
Authority
JP
Japan
Prior art keywords
frequency
circuit
fed
gain control
signal
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
JP9531478A
Other languages
Japanese (ja)
Inventor
Noriyoshi Ito
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 JP9531478A priority Critical patent/JPS5521682A/en
Publication of JPS5521682A publication Critical patent/JPS5521682A/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

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To enable the gain control of wide band, by controlling the conversion circuit in frequency convering the intermediate frequency signal and the circuit in frequency converting the converted frequency again with the output of the same local oscillator to pick up the control voltage from a given frequency. CONSTITUTION:The signal at intermediate frequency fed to the input terminal A is fed to the frequency conversion circuit 2 via the gain control circuit 1, frequency conversion is made with the frequency produced from the local oscillation circuit 7, the signal in frequency conversion is branched with the branch circuit 3 and outputted to the output terminal B and fed to the frequency conversion circuit 4. To the conversion circuit 4, the oscillation frequency of the same oscillator 7 as being fed to the conversion circuit 2 is fed, the signal of the same frequency as the input intermediate frequency is fed to the detection circuit 5, the signal having required band is picked up at the detection circuit 5, the output of the circuit 5 is fed to the control circuit 6, and the gain control of the gain control circuit 1 is controlled with required band width.
JP9531478A 1978-08-03 1978-08-03 Automatic gain control unit Pending JPS5521682A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9531478A JPS5521682A (en) 1978-08-03 1978-08-03 Automatic gain control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9531478A JPS5521682A (en) 1978-08-03 1978-08-03 Automatic gain control unit

Publications (1)

Publication Number Publication Date
JPS5521682A true JPS5521682A (en) 1980-02-15

Family

ID=14134284

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9531478A Pending JPS5521682A (en) 1978-08-03 1978-08-03 Automatic gain control unit

Country Status (1)

Country Link
JP (1) JPS5521682A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6414722U (en) * 1987-07-20 1989-01-25
JP2881187B2 (en) * 1990-10-31 1999-04-12 ノーザン・テレコム・リミテッド Radio frequency power amplifier clipping control method and transmitter for radio frequency communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6414722U (en) * 1987-07-20 1989-01-25
JP2881187B2 (en) * 1990-10-31 1999-04-12 ノーザン・テレコム・リミテッド Radio frequency power amplifier clipping control method and transmitter for radio frequency communication system

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