JPS60127026U - AGC circuit - Google Patents
AGC circuitInfo
- Publication number
- JPS60127026U JPS60127026U JP1515484U JP1515484U JPS60127026U JP S60127026 U JPS60127026 U JP S60127026U JP 1515484 U JP1515484 U JP 1515484U JP 1515484 U JP1515484 U JP 1515484U JP S60127026 U JPS60127026 U JP S60127026U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- agc
- agc circuit
- conduction
- frequency amplifier
- 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
Links
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来のチューナを構成するＡＭ／ＦＭ復調回路
の一例を示す回路図、第２図は第１図のレベルメータ信
号生成回路の特性図、第３図は本考案になるＡＧＣ回路
の一実施例を示す回路図、第４図は本考案になるＡＧＣ
回路の応用実施例を示す回路図である。
１・・・集積回路、２・・・電源端子、４・・・層高周
波増幅器（ＡＭ−ＲＦアンプ）、５・・・ＡＭ混合器、
６・・・ＡＭ局部発振器゛、７・・・帯域フィルタ、８
・・・ −ＡＭ／ＦＭ共用中間周波数増幅器（ＡＭ／
ＦＭ共用ＩＦアンプ）、９・・・ＡＭ検波器、１０・・
・音声信号用のアンプ、１２・・・出力端子、１３・・
・ＡＧＣ回路、 ・１４．１５，１６・・・コンデン
サ、１７・・・入力端子、１８・・・ＦＭ−ＩＦアンプ
、１９・・・ＦＭ検波器、２０・・・レベルメータ信号
生成回路、２１・・・レベルメータ出力端子、２３・・
・コンデンサ、２４・・・トランジスタ、２６・・・発
光ダイオード。Fig. 1 is a circuit diagram showing an example of an AM/FM demodulation circuit constituting a conventional tuner, Fig. 2 is a characteristic diagram of the level meter signal generation circuit of Fig. 1, and Fig. 3 is a diagram of the AGC circuit according to the present invention. A circuit diagram showing one embodiment, FIG. 4 is an AGC according to the present invention.
FIG. 2 is a circuit diagram showing an applied example of the circuit. DESCRIPTION OF SYMBOLS 1... Integrated circuit, 2... Power supply terminal, 4... Layer high frequency amplifier (AM-RF amplifier), 5... AM mixer,
6...AM local oscillator, 7...Band filter, 8
... -AM/FM common intermediate frequency amplifier (AM/FM
FM common IF amplifier), 9...AM detector, 10...
・Amplifier for audio signal, 12... Output terminal, 13...
・AGC circuit, ・14.15, 16... Capacitor, 17... Input terminal, 18... FM-IF amplifier, 19... FM detector, 20... Level meter signal generation circuit, 21 ...Level meter output terminal, 23...
・Capacitor, 24... Transistor, 26... Light emitting diode.
Claims (2)
号が供給される高周波増幅器、中間周波増幅器、ＡＭ又
はＦＭ復調回路及び自動利得制御（ＡＧＣ）回路等を具
備した受信機において、受信電波の入力レベルに応じた
電圧の信号が供給されて、その入力レベルが所定値を越
えると導通ずるスイッチング声子を設け、前記ス゛
イツチング素子の導通によって前記自動利得制御回路と
接地点との間に接続されたコンデンサの容量値が増加守
るよう構成したことを特徴とするＡＧＣ回路。(1) In a receiver that receives ■ or FM broadcast waves and is equipped with a high frequency amplifier, an intermediate frequency amplifier, an AM or FM demodulation circuit, an automatic gain control (AGC) circuit, etc., to which an AM signal or FM signal is supplied, A switching voice is provided which is supplied with a voltage signal corresponding to the input level of the radio wave and which becomes conductive when the input level exceeds a predetermined value.
An AGC circuit characterized in that the capacitance value of a capacitor connected between the automatic gain control circuit and a ground point increases due to conduction of the switching element.
用の表示素子を動作せしめるものであることを特徴とす
る実用新案登録請求の範囲第１項記載のＡＧＣ回路。(2) The AGC circuit according to claim 1, wherein the switching element operates a display element for tuning display through conduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1515484U JPS60127026U (en) | 1984-02-06 | 1984-02-06 | AGC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1515484U JPS60127026U (en) | 1984-02-06 | 1984-02-06 | AGC circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60127026U true JPS60127026U (en) | 1985-08-27 |
Family
ID=30500736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1515484U Pending JPS60127026U (en) | 1984-02-06 | 1984-02-06 | AGC circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60127026U (en) |
-
1984
- 1984-02-06 JP JP1515484U patent/JPS60127026U/en active Pending
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