JPH0423329U - - Google Patents
Info
- Publication number
- JPH0423329U JPH0423329U JP6364090U JP6364090U JPH0423329U JP H0423329 U JPH0423329 U JP H0423329U JP 6364090 U JP6364090 U JP 6364090U JP 6364090 U JP6364090 U JP 6364090U JP H0423329 U JPH0423329 U JP H0423329U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- tuning
- tuning circuit
- capacitor
- high frequency
- 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 description 4
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案の電子同調回路における高周波
切換回路の第１実施例による回路構成図、第２図
は第２実施例による回路構成図、第３図は第３実
施例による回路構成図、第４図ａは従来の高周波
切換回路の例を示す回路構成図、第４図ｂ，ｃは
同回路をバンド切換したのきの一次側の回路図、
第５図は従来の他の例を示す回路構成図である。
ＲＦ１，ＲＦ２……同調回路（高周波コイル）
、ＣＴ……トリマコンデンサ、Ｃ１，Ｃ２，Ｃ３
，Ｃ５，Ｃ６……コンデンサ、ＶＣ１……可変容
量ダイオード（バリキヤツプ）、Ｑ１，Ｑ２……
トランジスタ、ＳＷ１……切換スイツチ、Ｄ１，
Ｄ２，Ｄ３，Ｄ４……ダイオード。
FIG. 1 is a circuit diagram according to a first embodiment of a high frequency switching circuit in an electronic tuning circuit of the present invention, FIG. 2 is a circuit diagram according to a second embodiment, and FIG. 3 is a circuit diagram according to a third embodiment. Figure 4a is a circuit configuration diagram showing an example of a conventional high frequency switching circuit, Figures 4b and c are primary side circuit diagrams of the same circuit with band switching,
FIG. 5 is a circuit configuration diagram showing another conventional example. RF1, RF2...tuned circuit (high frequency coil)
, CT... trimmer capacitor, C1, C2, C3
, C5, C6... Capacitor, VC1... Variable capacitance diode (varicap), Q1, Q2...
Transistor, SW1...Selector switch, D1,
D2, D3, D4...diodes.
Claims (1)
同調回路と、これら複数の同調回路の中から所望
の周波数バンドに応じた一つの同調回路を選択す
るための選択手段とを備えた電子同調回路におけ
る高周波切換回路において、 前記選択手段は前記各同調回路にそれぞれ並列
に接続された複数のスイツチング素子からなり、
各同調回路の非接地側間に可変容量ダイオードの
アノードカソードとコンデンサの直列路を接続し
、前記可変容量ダイオードのカソードとコンデン
サの接続点に同調電圧を入力すると共に、所望の
周波数バンドに応じて前記スイツチング素子の導
通・不導通を制御するようにしたことを特徴とす
る電子同調回路におる高周波切換回路。[Claims for Utility Model Registration] A tuning circuit for a plurality of frequency bands into which a tuning voltage is input, and a selection means for selecting one tuning circuit according to a desired frequency band from among the plurality of tuning circuits. In a high frequency switching circuit in an electronic tuning circuit, the selection means includes a plurality of switching elements each connected in parallel to each tuning circuit,
A series path of the anode cathode of a variable capacitance diode and a capacitor is connected between the non-grounded sides of each tuning circuit, and a tuning voltage is input to the connection point between the cathode of the variable capacitance diode and the capacitor, and A high frequency switching circuit in an electronic tuning circuit, characterized in that conduction/nonconduction of the switching element is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6364090U JPH0423329U (en) | 1990-06-15 | 1990-06-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6364090U JPH0423329U (en) | 1990-06-15 | 1990-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0423329U true JPH0423329U (en) | 1992-02-26 |
Family
ID=31593874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6364090U Pending JPH0423329U (en) | 1990-06-15 | 1990-06-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0423329U (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5885620A (en) * | 1981-11-17 | 1983-05-23 | Hitachi Ltd | Multiband electronic switching circuit |
| JPS5885621A (en) * | 1981-11-17 | 1983-05-23 | Hitachi Ltd | Multiband electronic switching circuit |
| JPS61156927A (en) * | 1984-12-27 | 1986-07-16 | Matsushita Electric Ind Co Ltd | Local oscillating circuit of receiver |
| JPH0210643B2 (en) * | 1983-02-14 | 1990-03-09 | Sumitomo Denki Kogyo Kk |
-
1990
- 1990-06-15 JP JP6364090U patent/JPH0423329U/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5885620A (en) * | 1981-11-17 | 1983-05-23 | Hitachi Ltd | Multiband electronic switching circuit |
| JPS5885621A (en) * | 1981-11-17 | 1983-05-23 | Hitachi Ltd | Multiband electronic switching circuit |
| JPH0210643B2 (en) * | 1983-02-14 | 1990-03-09 | Sumitomo Denki Kogyo Kk | |
| JPS61156927A (en) * | 1984-12-27 | 1986-07-16 | Matsushita Electric Ind Co Ltd | Local oscillating circuit of receiver |
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