JPS628725U - - Google Patents
Info
- Publication number
- JPS628725U JPS628725U JP9872185U JP9872185U JPS628725U JP S628725 U JPS628725 U JP S628725U JP 9872185 U JP9872185 U JP 9872185U JP 9872185 U JP9872185 U JP 9872185U JP S628725 U JPS628725 U JP S628725U
- Authority
- JP
- Japan
- Prior art keywords
- aft
- variable capacitance
- capacitance diode
- resistor
- resonant line
- 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
- 238000010586 diagram Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図は本考案に係るＡＦＴ回路装置を有する
ＵＨＦチユーナ用局部発振回路の要部回路図、第
２図は従来のＡＦＴ付発振回路図、及び第３図は
ＡＦＴ特性曲線図である。
２０…ＡＦＴ回路、２１…結合用チツプコンデ
ンサ、２２…ＡＦＴ用可変容量ダイオード、２３
…ダンピング用チツプ抵抗。
FIG. 1 is a circuit diagram of a main part of a local oscillation circuit for a UHF tuner having an AFT circuit device according to the present invention, FIG. 2 is a diagram of a conventional oscillation circuit with an AFT, and FIG. 3 is a diagram of an AFT characteristic curve. 20...AFT circuit, 21...coupling chip capacitor, 22...variable capacitance diode for AFT, 23
...chip resistor for damping.
Claims (1)
ＵＨＦチユーナの局部発振回路において、前記共
振線路にリードレスタイプの結合用コンデンサを
介してＡＦＴ用可変容量ダイオードと抵抗の直列
回路を接続し、前記抵抗の抵抗値をダンピング効
果の生ずる範囲内に設定して前記ＡＦＴ用可変容
量ダイオードの容量及びリードインダクタンスに
よるＡＦＴ誤動作を阻止したことを特徴とするＡ
ＦＴ回路装置。 In a local oscillation circuit of a UHF tuner consisting of a tuning variable capacitance diode and a resonant line, a series circuit of an AFT variable capacitance diode and a resistor is connected to the resonant line via a leadless type coupling capacitor, and the resistance of the resistor is A characterized in that AFT malfunctions due to the capacitance and lead inductance of the variable capacitance diode for AFT are prevented by setting the value within a range where a damping effect occurs.
FT circuit device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9872185U JPS628725U (en) | 1985-06-27 | 1985-06-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9872185U JPS628725U (en) | 1985-06-27 | 1985-06-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS628725U true JPS628725U (en) | 1987-01-20 |
Family
ID=30966940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9872185U Pending JPS628725U (en) | 1985-06-27 | 1985-06-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS628725U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0515806U (en) * | 1991-08-22 | 1993-03-02 | オカモト株式会社 | Satsuka shoe's sole structure |
-
1985
- 1985-06-27 JP JP9872185U patent/JPS628725U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0515806U (en) * | 1991-08-22 | 1993-03-02 | オカモト株式会社 | Satsuka shoe's sole structure |
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