JPS5899946U - front end circuit - Google Patents
front end circuitInfo
- Publication number
- JPS5899946U JPS5899946U JP19608581U JP19608581U JPS5899946U JP S5899946 U JPS5899946 U JP S5899946U JP 19608581 U JP19608581 U JP 19608581U JP 19608581 U JP19608581 U JP 19608581U JP S5899946 U JPS5899946 U JP S5899946U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- tuning circuit
- end circuit
- input
- antenna
- 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
- Noise Elimination (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (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図は本考案の一実施例を説明する為のフロントエン
ド回路のブロックダイアグラム、第２図は本考案の一実
施例を示す具体的回路図、第３図は単同調及び複同調回
路の選択度特性図、第４図は相互変調妨害の特性図を夫
々示す。
１・・・・・・単同調回路、２・・・・・・複同調回路
、３・・・・・・ＲＦ増巾回路、Ｔｓ・・・・・・制御
用電源端子、Ｔ・・・・・・入力信号供給端子、ＴＡ・
・・・・・ＡＧＣ電圧供給端子、ＴＴ・・・・・・同調
型供給端子、Ｄｌ、Ｄ２・・・・・・スイッチングダイ
オード、Ｌ□、Ｌ２・・・・・・コイル、Ｑ・・・・・
・電界効果型トランジスタ（ＦＥＴ）、Ｃ１〜Ｃ１□・
・・・・・コンデンサ、Ｒ□〜Ｒ１ｏ・・・・・・抵抗
。Fig. 1 is a block diagram of a front-end circuit for explaining an embodiment of the present invention, Fig. 2 is a specific circuit diagram showing an embodiment of the present invention, and Fig. 3 is a block diagram of a single-tuned and double-tuned circuit. FIG. 4 shows a selectivity characteristic diagram and a characteristic diagram of intermodulation interference. 1...Single tuning circuit, 2...Double tuning circuit, 3...RF amplifying circuit, Ts...Control power supply terminal, T... ...Input signal supply terminal, TA・
... AGC voltage supply terminal, TT ... Tuning type supply terminal, Dl, D2 ... Switching diode, L□, L2 ... Coil, Q ...・・・
・Field effect transistor (FET), C1~C1□・
...Capacitor, R□~R1o...Resistance.
Claims (1)
巾器−１供給するフロントエンド回路において、単同調
回路と多段同調回路とを具備し、相互変調妨害のないと
きは該単同調回路を介して、該相互変調妨害のあるとき
は該多段同調回路を介して夫々ＲＦ増巾器へ該入力信号
を供給する様にした事を特徴とするフロントエンド回路
。A front-end circuit that supplies an input signal from an antenna to the RF amplifier-1 through an input tuning circuit includes a single tuning circuit and a multi-stage tuning circuit, and when there is no intermodulation interference, the front end circuit supplies the input signal from the antenna to the RF amplifier-1 through the input tuning circuit. A front-end circuit characterized in that, when there is intermodulation interference, the input signals are supplied to the respective RF amplifiers via the multi-stage tuning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19608581U JPS5899946U (en) | 1981-12-26 | 1981-12-26 | front end circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19608581U JPS5899946U (en) | 1981-12-26 | 1981-12-26 | front end circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5899946U true JPS5899946U (en) | 1983-07-07 |
Family
ID=30109334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19608581U Pending JPS5899946U (en) | 1981-12-26 | 1981-12-26 | front end circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5899946U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141844A (en) * | 1979-04-24 | 1980-11-06 | Onkyo Corp | Fm stereo tuner circuit |
-
1981
- 1981-12-26 JP JP19608581U patent/JPS5899946U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141844A (en) * | 1979-04-24 | 1980-11-06 | Onkyo Corp | Fm stereo tuner circuit |
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