JPS5647112A - Am receiver - Google Patents

Am receiver

Info

Publication number
JPS5647112A
JPS5647112A JP12261779A JP12261779A JPS5647112A JP S5647112 A JPS5647112 A JP S5647112A JP 12261779 A JP12261779 A JP 12261779A JP 12261779 A JP12261779 A JP 12261779A JP S5647112 A JPS5647112 A JP S5647112A
Authority
JP
Japan
Prior art keywords
input
agc circuit
modulation characteristics
cross modulation
receiver
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
JP12261779A
Other languages
Japanese (ja)
Inventor
Kozo Miura
Haruo Suzuki
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.)
Faurecia Clarion Electronics Co Ltd
Original Assignee
Clarion 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 Clarion Co Ltd filed Critical Clarion Co Ltd
Priority to JP12261779A priority Critical patent/JPS5647112A/en
Publication of JPS5647112A publication Critical patent/JPS5647112A/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
    • H03G3/3063—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 using at least one transistor as controlling device, the transistor being used as a variable impedance device

Landscapes

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

Abstract

PURPOSE:To improve cross modulation characteristics by providing an AGC circuit that starts operation when a large input resulting in the saturation of S/N arrives. CONSTITUTION:In general, S/N of an AM receiver improves according to the intensity of an input signal and, when an input exceeds about 50dB, gets saturated. Then, cross modulation characteristics deteriorate remarkably when an input signal of not less than 50dB arrives. For this purpose, AGC circuit 7 of a different system from conventional AGC circuit 6 is provided. Then, AGC circuit 7 operates for the high-frequency amplifying circuit or input attenuator of the receiver only in arrival of a large input to limit the input level to about 50dB. As a result, S/N maintains its saturation level and cross modulation characteristics never deteriorate even in arrival of the large input.
JP12261779A 1979-09-26 1979-09-26 Am receiver Pending JPS5647112A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12261779A JPS5647112A (en) 1979-09-26 1979-09-26 Am receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12261779A JPS5647112A (en) 1979-09-26 1979-09-26 Am receiver

Publications (1)

Publication Number Publication Date
JPS5647112A true JPS5647112A (en) 1981-04-28

Family

ID=14840381

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12261779A Pending JPS5647112A (en) 1979-09-26 1979-09-26 Am receiver

Country Status (1)

Country Link
JP (1) JPS5647112A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS581311A (en) * 1981-06-26 1983-01-06 Nippon Enkaku Seigyo Kk Receiver
JPH05175767A (en) * 1991-12-19 1993-07-13 Matsushita Electric Ind Co Ltd Current control circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5325477U (en) * 1976-08-11 1978-03-03

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5325477U (en) * 1976-08-11 1978-03-03

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS581311A (en) * 1981-06-26 1983-01-06 Nippon Enkaku Seigyo Kk Receiver
JPH0129084B2 (en) * 1981-06-26 1989-06-07 Nippon Enkaku Seigyo Kk
JPH05175767A (en) * 1991-12-19 1993-07-13 Matsushita Electric Ind Co Ltd Current control circuit

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