JPS58107622U - VHF tuner coupling circuit - Google Patents
VHF tuner coupling circuitInfo
- Publication number
- JPS58107622U JPS58107622U JP386382U JP386382U JPS58107622U JP S58107622 U JPS58107622 U JP S58107622U JP 386382 U JP386382 U JP 386382U JP 386382 U JP386382 U JP 386382U JP S58107622 U JPS58107622 U JP S58107622U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- tuning
- voltage
- coupling circuit
- vhf tuner
- 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
- Channel Selection Circuits, Automatic Tuning Circuits (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ＶＨＦチューナの同調回路と高周波増幅回路間
の従来の結合回路を示す回路図、第２図は本考案−実施
例を示す回路図である。
１．２・・・・・・同調コイル、３・・・・・・増幅用
素子（ＦＥＴ）、７・・・・・・スイッチングダイオー
ド、１３・・・・・・可変容量ダイオード、１４・・・
・・・結合回路、Ｒ１゜−Ｒ２・・・・・・ブリーダ抵
抗（直流バイアス回路）、Ｒ３，Ｒ４・・・・・・抵抗
、■Ｌ・・・・・・ロウチャンネル切換 一端子、
■□・・・・・・ハイチャンネル切換端子。FIG. 1 is a circuit diagram showing a conventional coupling circuit between a VHF tuner tuning circuit and a high frequency amplifier circuit, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1.2... Tuning coil, 3... Amplifying element (FET), 7... Switching diode, 13... Variable capacitance diode, 14...・
...Coupling circuit, R1゜-R2...Bleeder resistance (DC bias circuit), R3, R4...Resistor, ■L...Low channel switching one terminal,
■□・・・・・・High channel switching terminal.
Claims (1)
ド切換用スイッチングダイオードと直列接続された二個
の同調コイルを含む同調回路を接続し、スイッチングダ
イオードの印加電圧を変えて受信周波数帯のハイチャン
ネルとロウチャンネルを切り換えるチューナにおいて、
前記増幅段と前記同調回路の結合に、前記バイアス回路
の所定電圧と前記同調コイルのスイッチング電圧との差
電圧によって逆バイアスされる可変容量ダイオードを用
いたことを特徴とするＶＨＦチューナの結合回路。A predetermined bias circuit and panning circuit are installed on the input side of the amplification stage.
In a tuner that connects a tuning circuit including a switching diode and two tuning coils connected in series, and changes the voltage applied to the switching diode to switch between a high channel and a low channel in the receiving frequency band,
A coupling circuit for a VHF tuner, characterized in that a variable capacitance diode reverse biased by a voltage difference between a predetermined voltage of the bias circuit and a switching voltage of the tuning coil is used to couple the amplifier stage and the tuning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP386382U JPS58107622U (en) | 1982-01-13 | 1982-01-13 | VHF tuner coupling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP386382U JPS58107622U (en) | 1982-01-13 | 1982-01-13 | VHF tuner coupling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58107622U true JPS58107622U (en) | 1983-07-22 |
Family
ID=30016748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP386382U Pending JPS58107622U (en) | 1982-01-13 | 1982-01-13 | VHF tuner coupling circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58107622U (en) |
-
1982
- 1982-01-13 JP JP386382U patent/JPS58107622U/en active Pending
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