JPH0255735U - - Google Patents
Info
- Publication number
- JPH0255735U JPH0255735U JP13402488U JP13402488U JPH0255735U JP H0255735 U JPH0255735 U JP H0255735U JP 13402488 U JP13402488 U JP 13402488U JP 13402488 U JP13402488 U JP 13402488U JP H0255735 U JPH0255735 U JP H0255735U
- Authority
- JP
- Japan
- Prior art keywords
- tuning coil
- input
- low band
- tuning
- band
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図はこの考案の第１の実施例の構成を示す
回路図、第２図は同実施例のハイバンド受信時の
等価回路図、第３図は同実施例のローバンド受信
時の等価回路図、第４図は実施例と従来例の同調
特性を比較するための特性図、第５図は実施例と
従来例の利得特性を比較するための特性図、第６
図は実施例と従来例の混変調特性を比較するため
の特性図、第７図はこの考案の第２の実施例の構
成を示す回路図、第８図は同実施例のハイバンド
受信時の等価回路図、第９図は同実施例のローバ
ンド受信時の等価回路図、第１０図は従来の入力
同調回路の構成を示す回路図、第１１図および第
１２図は各々第１０図に示す回路のハイバンド受
信時およびローバンド受信時の等価回路図である
。
３，１２……コイル（ローバンド用同調コイル
）、４……ダイオード（スイツチ手段）、７……
コンデンサ（第２の静電容量手段）、８，１３…
…コイル（ハイバンド用同調コイル）、９……可
変容量ダイオード（第１の静電容量手段）、２０
……可変容量ダイオード（可変容量手段）、２８
……可変容量ダイオード、２９……コンデンサ（
並列回路）、３１……ダイオード（並列回路）。
Fig. 1 is a circuit diagram showing the configuration of the first embodiment of this invention, Fig. 2 is an equivalent circuit diagram of the same embodiment during high band reception, and Fig. 3 is an equivalent circuit diagram of the same embodiment during low band reception. 4 is a characteristic diagram for comparing the tuning characteristics of the embodiment and the conventional example. FIG. 5 is a characteristic diagram for comparing the gain characteristics of the embodiment and the conventional example.
The figure is a characteristic diagram for comparing the cross-modulation characteristics of the embodiment and the conventional example, Fig. 7 is a circuit diagram showing the configuration of the second embodiment of this invention, and Fig. 8 is a high-band reception time of the same embodiment. 9 is an equivalent circuit diagram of the same embodiment during low band reception, FIG. 10 is a circuit diagram showing the configuration of a conventional input tuning circuit, and FIGS. 11 and 12 are respectively shown in FIG. 10. FIG. 3 is an equivalent circuit diagram of the circuit shown in FIG. 2 during high band reception and low band reception. 3, 12... Coil (low band tuning coil), 4... Diode (switching means), 7...
Capacitor (second capacitance means), 8, 13...
... Coil (tuning coil for high band), 9 ... Variable capacitance diode (first capacitance means), 20
...Variable capacitance diode (variable capacitance means), 28
...Variable capacitance diode, 29...Capacitor (
Parallel circuit), 31...Diode (parallel circuit).
Claims (1)
調コイルと、 一端が前記入力端に接続されていてローバンド
受信時に非導通状態にされハイバンド受信時に導
通状態にされるスイツチ手段と、 一端が前記ローバンド用同調コイルの他端に接
続され他端が前記スイツチ手段の他端に接続され
ているローバンド受信時に逆バイアス電圧が加え
られハイバンド受信時に順バイアス電圧が加えら
れる可変容量ダイオードと、 一端が前記ローバンド用同調コイルの他端に接
続され他端が可変容量手段を介して接地されたハ
イバンド用同調コイルと、 前記ハイバンド用同調コイルの他端と高周波増
幅器の入力端とを接続する第１の静電容量手段と
、前記スイツチ手段の他端と前記高周波増幅器の
入力端とを接続する第２の静電容量手段、 とを具備することを特徴とする入力同調回路。 (2) 請求項１記載の入力同調回路において、可
変容量ダイオードに代えてスイツチ用ダイオード
とコンデンサとの並列接続回路を用いたことを特
徴とする入力同調回路。[Claims for Utility Model Registration] (1) A tuning coil for low band, one end of which is connected to the input end, and one end of which is connected to the input end, which is in a non-conducting state when receiving a low band and is in a conducting state when receiving a high band. one end is connected to the other end of the low band tuning coil and the other end is connected to the other end of the switch means, a reverse bias voltage is applied during low band reception and a forward bias voltage is applied during high band reception. a variable capacitance diode added; a high band tuning coil having one end connected to the other end of the low band tuning coil and the other end grounded via a variable capacitance means; and a high frequency tuning coil connected to the other end of the high band tuning coil. It is characterized by comprising: a first capacitance means for connecting the input end of the amplifier; and a second capacitance means for connecting the other end of the switch means and the input end of the high frequency amplifier. input tuning circuit. (2) The input tuning circuit according to claim 1, wherein a parallel connection circuit of a switching diode and a capacitor is used in place of the variable capacitance diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13402488U JPH066619Y2 (en) | 1988-10-14 | 1988-10-14 | Input tuning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13402488U JPH066619Y2 (en) | 1988-10-14 | 1988-10-14 | Input tuning circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0255735U true JPH0255735U (en) | 1990-04-23 |
| JPH066619Y2 JPH066619Y2 (en) | 1994-02-16 |
Family
ID=31392419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13402488U Expired - Lifetime JPH066619Y2 (en) | 1988-10-14 | 1988-10-14 | Input tuning circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH066619Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02159810A (en) * | 1988-12-14 | 1990-06-20 | Hitachi Ltd | Vhf two-band input circuit |
-
1988
- 1988-10-14 JP JP13402488U patent/JPH066619Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02159810A (en) * | 1988-12-14 | 1990-06-20 | Hitachi Ltd | Vhf two-band input circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH066619Y2 (en) | 1994-02-16 |
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