JPH0277926U - - Google Patents
Info
- Publication number
- JPH0277926U JPH0277926U JP15578988U JP15578988U JPH0277926U JP H0277926 U JPH0277926 U JP H0277926U JP 15578988 U JP15578988 U JP 15578988U JP 15578988 U JP15578988 U JP 15578988U JP H0277926 U JPH0277926 U JP H0277926U
- Authority
- JP
- Japan
- Prior art keywords
- coil
- tuner
- pin diode
- tuning circuit
- signal level
- 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 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案の一実施例の回路図、第２図は
第１図に示す回路の同調特性の概略を示す図、第
３図は従来回路の回路図、第４図は第３図に示す
回路の同調特性の概略を示す図である。
１，３，４，５，６…入力端子、２…ＭＯＳＦ
ＥＴ、Ｄ１〜Ｄ４…ｐｉｎダイオード、ＢＤ１，
ＢＤ２…バラクタダイオード、Ｌ１〜Ｌ４…コイ
ル、Ｒ１〜Ｒ５…抵抗、Ｃ１〜Ｃ３…コンデンサ
、Ｑ…トランジスタ。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a diagram schematically showing the tuning characteristics of the circuit shown in Fig. 1, Fig. 3 is a circuit diagram of a conventional circuit, and Fig. 4 is a diagram showing the outline of the tuning characteristics of the circuit shown in Fig. 1. FIG. 2 is a diagram schematically showing the tuning characteristics of the circuit shown in FIG. 1, 3, 4, 5, 6...Input terminal, 2...MOSF
ET, D1 to D4 ...pin diode, BD1 ,
BD2 ...Varactor diode, L1 - L4 ...Coil, R1 - R5 ...Resistor, C1 - C3 ...Capacitor, Q...Transistor.
Claims (1)
ずれか一方または両方を可変することにより所定
周波数の信号を選択するＦＭチユーナの同調回路
において、該コイルを互いに誘導結合された１次
コイル及び２次コイルとし、該１次コイルに直列
にｐｉｎダイオを接続し、検出した信号レベルに
応じて該ＰＩＮダイオードに加えるバイアス電圧
を変化させる信号レベル検出手段を具備してなる
ＦＭチユーナの同調回路。 In an FM tuner tuning circuit that selects a signal of a predetermined frequency by varying one or both of a coil and a capacitor connected in parallel, the coils are used as a primary coil and a secondary coil that are inductively coupled to each other. A tuning circuit for an FM tuner, comprising: a pin diode connected in series to the primary coil; and signal level detection means for changing a bias voltage applied to the pin diode according to a detected signal level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15578988U JPH0441625Y2 (en) | 1988-11-30 | 1988-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15578988U JPH0441625Y2 (en) | 1988-11-30 | 1988-11-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0277926U true JPH0277926U (en) | 1990-06-14 |
| JPH0441625Y2 JPH0441625Y2 (en) | 1992-09-30 |
Family
ID=31433728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15578988U Expired JPH0441625Y2 (en) | 1988-11-30 | 1988-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0441625Y2 (en) |
-
1988
- 1988-11-30 JP JP15578988U patent/JPH0441625Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0441625Y2 (en) | 1992-09-30 |
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