JPH0241517U - - Google Patents
Info
- Publication number
- JPH0241517U JPH0241517U JP11944488U JP11944488U JPH0241517U JP H0241517 U JPH0241517 U JP H0241517U JP 11944488 U JP11944488 U JP 11944488U JP 11944488 U JP11944488 U JP 11944488U JP H0241517 U JPH0241517 U JP H0241517U
- Authority
- JP
- Japan
- Prior art keywords
- tuning
- antenna
- tuning voltage
- voltage
- circuit
- 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
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図は本考案の第１実施例によるアンテナ同
調回路を示す回路図、第２図はバラクタダイオー
ドによる降伏特性を示す線図、第３図と第４図は
それぞれ第２実施例と第３実施例によるアンテナ
同調回路を示す回路図、第５図と第６図は従来の
アンテナ同調回路を示す回路図である。
Ｄ……ツイン・バラクタダイオード、Ｄ１，Ｄ
２……バラクタダイオード、１２……同調コイル
、１５……増幅用ＦＥＴ、ＶＴ……同調電圧。
FIG. 1 is a circuit diagram showing the antenna tuning circuit according to the first embodiment of the present invention, FIG. 2 is a diagram showing the breakdown characteristics of a varactor diode, and FIGS. 3 and 4 are diagrams showing the antenna tuning circuit according to the second embodiment and the third embodiment, respectively. A circuit diagram showing an antenna tuning circuit according to an embodiment, and FIGS. 5 and 6 are circuit diagrams showing a conventional antenna tuning circuit. D...Twin varactor diode, D1, D
2... Varactor diode, 12... Tuning coil, 15... FET for amplification, VT... Tuning voltage.
Claims (1)
に応じて容量が変化するバラクタダイオードと、
この可変容量と並列に接続された同調コイルとを
有しているアンテナ同調回路において、アンテナ
入力が前記同調電圧とともに一対設けられた上記
バラクタダイオードの各々のカソード側に接続さ
れていることを特徴とする受信器におけるアンテ
ナ同調回路。 a varactor diode to which a reverse-biased tuning voltage is applied and whose capacitance changes according to this tuning voltage;
In the antenna tuning circuit having the variable capacitor and a tuning coil connected in parallel, the antenna input is connected to the cathode side of each of the pair of varactor diodes along with the tuning voltage. Antenna tuning circuit in a receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11944488U JPH0241517U (en) | 1988-09-12 | 1988-09-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11944488U JPH0241517U (en) | 1988-09-12 | 1988-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0241517U true JPH0241517U (en) | 1990-03-22 |
Family
ID=31364680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11944488U Pending JPH0241517U (en) | 1988-09-12 | 1988-09-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0241517U (en) |
-
1988
- 1988-09-12 JP JP11944488U patent/JPH0241517U/ja active Pending
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