JPS615043U - Local oscillation circuit in superheterodyne reception system - Google Patents
Local oscillation circuit in superheterodyne reception systemInfo
- Publication number
- JPS615043U JPS615043U JP8786884U JP8786884U JPS615043U JP S615043 U JPS615043 U JP S615043U JP 8786884 U JP8786884 U JP 8786884U JP 8786884 U JP8786884 U JP 8786884U JP S615043 U JPS615043 U JP S615043U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- local oscillation
- oscillation circuit
- reception system
- intermediate frequency
- 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
- Superheterodyne Receivers (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図は従来技術の局部発振回路を説明するための図、
第２図は従来技術の局部発振周波数のずれを補正したと
きの特性を示す図、第３図は本考案の一実施例の局部発
振回路の電気回路図、第４図は中間周波数ずれ検出回路
の出力特性を示す図、第５図は本考案の局部発振周波数
を補正したときの特性を示す図である。
７・・・中間周波数ずれ検出回路、１０・・・局部発振
回路、Ｑ−ｈランジスタ、０１〜ＣＩＯ・・・コンデン
サ、Ｄ１〜Ｄ４・・・可変容量ダイオード、Ｌ１，Ｌ２
・・・コイル。FIG. 1 is a diagram for explaining a conventional local oscillation circuit,
Fig. 2 is a diagram showing the characteristics when the local oscillation frequency deviation of the conventional technology is corrected, Fig. 3 is an electric circuit diagram of a local oscillation circuit according to an embodiment of the present invention, and Fig. 4 is an intermediate frequency deviation detection circuit. FIG. 5 is a diagram showing the characteristics when the local oscillation frequency of the present invention is corrected. 7... Intermediate frequency shift detection circuit, 10... Local oscillation circuit, Q-h transistor, 01-CIO... Capacitor, D1-D4... Variable capacitance diode, L1, L2
···coil.
Claims (1)
号を受信し、局部発振周波数を発生する発振回路と、 中間周波数の予め定められた値とのずれを表わす信号を
導出する中間周波数ずれ検出回路と、前記発振回路に関
連して設けられ、中間周波数ずれ検出回路からの信号に
応答し、局部発振波数が予め定めた値に近づくように補
正する補正回路と、 補正回路に関連して設けられ、同調周波数に対応した前
記信号に応答して、補正回路による補正値が同調周波数
の変化に共なってずれることを防止する回路とを含むこ
とを特徴とするスーパヘテログイン受信方式における局
部発振回路。[Scope of Claim for Utility Model Registration] An active element, an oscillation circuit that is provided in connection with the active element and that receives a signal corresponding to a tuned frequency and generates a local oscillation frequency, and a predetermined value of an intermediate frequency. an intermediate frequency deviation detection circuit that derives a signal representing the deviation of the oscillation circuit; and an intermediate frequency deviation detection circuit that is provided in association with the oscillation circuit and corrects the local oscillation wave number so that it approaches a predetermined value in response to the signal from the intermediate frequency deviation detection circuit. and a circuit that is provided in association with the correction circuit and that responds to the signal corresponding to the tuning frequency to prevent the correction value by the correction circuit from shifting as the tuning frequency changes. A local oscillation circuit in a super heterolog reception system characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8786884U JPS615043U (en) | 1984-06-13 | 1984-06-13 | Local oscillation circuit in superheterodyne reception system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8786884U JPS615043U (en) | 1984-06-13 | 1984-06-13 | Local oscillation circuit in superheterodyne reception system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS615043U true JPS615043U (en) | 1986-01-13 |
Family
ID=30640480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8786884U Pending JPS615043U (en) | 1984-06-13 | 1984-06-13 | Local oscillation circuit in superheterodyne reception system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS615043U (en) |
-
1984
- 1984-06-13 JP JP8786884U patent/JPS615043U/en active Pending
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