JPS6217287U - - Google Patents
Info
- Publication number
- JPS6217287U JPS6217287U JP10779085U JP10779085U JPS6217287U JP S6217287 U JPS6217287 U JP S6217287U JP 10779085 U JP10779085 U JP 10779085U JP 10779085 U JP10779085 U JP 10779085U JP S6217287 U JPS6217287 U JP S6217287U
- Authority
- JP
- Japan
- Prior art keywords
- receiving
- bands
- circuit
- tuner
- switching
- 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
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案の広帯域受信用チユーナの一実
施例を示す要部回路構成図、第２図、第３図、第
４図はそれぞれ第１、第２、第３バンド受信時の
等価回路図、第５図は本考案の基本構成を示す図
、第６図は本考案の他の実施例を示す回路構成図
である。第７図は従来例を示す回路構成図、第８
図はその入力同調回路の等価回路図である。
Ｄ１…ＤＣ切換え用ダイオード、Ｄ２，Ｄ３…
バンド切換え用スイツチングダイオード、Ｄ５…
可変容量ダイオード、Ｌ８，Ｌ９，Ｌ１１，Ｌ１
３，Ｌ１４…同調用コイル、Ｍ２，Ｍ３…マツチ
ング回路。
Fig. 1 is a circuit diagram showing an embodiment of the broadband receiving tuner of the present invention, and Figs. 2, 3, and 4 are equivalent circuits for receiving the first, second, and third bands, respectively. 5 is a diagram showing the basic configuration of the present invention, and FIG. 6 is a circuit configuration diagram showing another embodiment of the present invention. Figure 7 is a circuit configuration diagram showing a conventional example;
The figure is an equivalent circuit diagram of the input tuning circuit. D1 ...DC switching diode, D2 , D3 ...
Switching diode for band switching, D5 ...
Variable capacitance diode, L 8 , L 9 , L 11 , L 1
3 , L14 ... Tuning coil, M2 , M3 ... Matching circuit.
Claims (1)
同調回路部に同調素子として可変容量ダイオード
を使用するとともに第１、第２、第３バンドを受
信するための同調コイルとバンド切換え用スイツ
チングダイオードを備えた３バンド切換え受信可
能な広帯域受信用チユーナであつて、少なくとも
第２、第３バンド受信時の入力マツチング回路と
してコイルとコンデンサの直列回路を用い、所定
の希望バンド受信時に前記直列回路の一部を非希
望バンドの信号に対するトラツプ回路として動作
させるようにしたことを特徴とする広帯域受信用
チユーナ。 A variable capacitance diode is used as a tuning element in the input tuning circuit section of the high frequency amplifier circuit of a television tuner, and a tuning coil for receiving the first, second and third bands and a switching diode for band switching are provided. The tuner is a broadband receiving tuner capable of receiving signals by switching between three bands, and uses a series circuit of a coil and a capacitor as an input matching circuit when receiving at least the second and third bands, and a part of the series circuit when receiving a predetermined desired band. 1. A broadband reception tuner, characterized in that it operates as a trap circuit for signals in undesired bands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10779085U JPS6217287U (en) | 1985-07-15 | 1985-07-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10779085U JPS6217287U (en) | 1985-07-15 | 1985-07-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6217287U true JPS6217287U (en) | 1987-02-02 |
Family
ID=30984390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10779085U Pending JPS6217287U (en) | 1985-07-15 | 1985-07-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6217287U (en) |
-
1985
- 1985-07-15 JP JP10779085U patent/JPS6217287U/ja active Pending
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