JPH01135834U - - Google Patents

Info

Publication number
JPH01135834U
JPH01135834U JP3188788U JP3188788U JPH01135834U JP H01135834 U JPH01135834 U JP H01135834U JP 3188788 U JP3188788 U JP 3188788U JP 3188788 U JP3188788 U JP 3188788U JP H01135834 U JPH01135834 U JP H01135834U
Authority
JP
Japan
Prior art keywords
frequency signal
signal
intermediate frequency
output
narrowband
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
JP3188788U
Other languages
Japanese (ja)
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 filed Critical
Priority to JP3188788U priority Critical patent/JPH01135834U/ja
Publication of JPH01135834U publication Critical patent/JPH01135834U/ja
Pending legal-status Critical Current

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

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図〜第３図は本考案の実施例を示すもので
あり、第１図はＦＭチユーナのフロントエンドな
らびに中間周波数増幅段を示す回路構成図、第２
図はＡＧＣコントロール信号の取り出し部を示す
回路図、第３図はゲンコントロールのための信号
の帯域幅ならびに強度を示す線図、第４図は従来
のＦＭチユーナのフロントエンドならびに中間周
波増幅段を示す回路構成図、第５図と第６図は従
来のＡＧＣコントロール信号の取り出し部を示す
回路図、第７図は従来のゲインコントロール信号
の帯域幅ならびに強度を示す線図である。 ４……高周波増幅回路、５……周波数混合器、
６……局部発振器、８……中間周波増幅器、１１
……狭帯域フイルタ、１２……広帯域ＡＧＣ回路
、１３……狭帯域ＡＧＣ回路、１４……オア回路
、Ｓ２……広帯域ＡＧＣコントロール信号、Ｓ２
……狭帯域ＡＧＣコントロール信号。 1 to 3 show an embodiment of the present invention, and FIG. 1 is a circuit diagram showing the front end and intermediate frequency amplification stage of an FM tuner, and FIG.
The figure is a circuit diagram showing the AGC control signal extraction section, Figure 3 is a diagram showing the bandwidth and intensity of the signal for gen control, and Figure 4 is a diagram showing the front end and intermediate frequency amplification stage of a conventional FM tuner. 5 and 6 are circuit diagrams showing a conventional AGC control signal extraction section, and FIG. 7 is a diagram showing the bandwidth and intensity of a conventional gain control signal. 4... High frequency amplifier circuit, 5... Frequency mixer,
6...Local oscillator, 8...Intermediate frequency amplifier, 11
... Narrowband filter, 12 ... Wideband AGC circuit, 13 ... Narrowband AGC circuit, 14 ... OR circuit, S 2 ... Wideband AGC control signal, S 2
 ...Narrowband AGC control signal.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] アンテナから入力した高周波信号を増幅する高
周波増幅器、増幅された高周波信号と局部発振器
から発振される局部発振周波信号とを混合して中
間周波数の信号を形成する周波数混合器、中間周
波数の信号を増幅する中間周波増幅器をそれぞれ
有しており、周波数混合器から出力される中間周
波数の信号が狭帯域フイルタを経て中間周波増幅
器に送られるようになつており、前記狭帯域フイ
ルタの前段から出力される広帯域ＡＧＣコントロ
ール信号と、狭帯域フイルタの後段から出力され
る狭帯域ＡＧＣコントロール信号のうちいずれか
強い信号に応じて前記高周波増幅器の利得を制御
するゲインコントロール手段が設けられて成るＦ
Ｍチユーナ。 A high frequency amplifier that amplifies the high frequency signal input from the antenna, a frequency mixer that mixes the amplified high frequency signal and a local oscillation frequency signal oscillated from a local oscillator to form an intermediate frequency signal, and amplifies the intermediate frequency signal. The intermediate frequency signal output from the frequency mixer is sent to the intermediate frequency amplifier via a narrow band filter, and is output from the stage before the narrow band filter. An F comprising gain control means for controlling the gain of the high-frequency amplifier according to a stronger signal among a wideband AGC control signal and a narrowband AGC control signal output from a subsequent stage of the narrowband filter.
M Chiyuna.
JP3188788U 1988-03-09 1988-03-09 Pending JPH01135834U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3188788U JPH01135834U (en) 1988-03-09 1988-03-09

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3188788U JPH01135834U (en) 1988-03-09 1988-03-09

Publications (1)

Publication Number Publication Date
JPH01135834U true JPH01135834U (en) 1989-09-18

Family

ID=31258090

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3188788U Pending JPH01135834U (en) 1988-03-09 1988-03-09

Country Status (1)

Country Link
JP (1) JPH01135834U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004021564A1 (en) * 2002-08-30 2004-03-11 Kabushiki Kaisha Toyota Jidoshokki Receiver and automatic gain control method thereof
JP2006013998A (en) * 2004-06-28 2006-01-12 Samsung Electronics Co Ltd Automatic gain controller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5837242B2 (en) * 1980-05-19 1983-08-15 工業技術院長 Heavy oil gasification method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5837242B2 (en) * 1980-05-19 1983-08-15 工業技術院長 Heavy oil gasification method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004021564A1 (en) * 2002-08-30 2004-03-11 Kabushiki Kaisha Toyota Jidoshokki Receiver and automatic gain control method thereof
JP2006013998A (en) * 2004-06-28 2006-01-12 Samsung Electronics Co Ltd Automatic gain controller

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