JPS5848149U - UHF tuner - Google Patents
UHF tunerInfo
- Publication number
- JPS5848149U JPS5848149U JP14440481U JP14440481U JPS5848149U JP S5848149 U JPS5848149 U JP S5848149U JP 14440481 U JP14440481 U JP 14440481U JP 14440481 U JP14440481 U JP 14440481U JP S5848149 U JPS5848149 U JP S5848149U
- Authority
- JP
- Japan
- Prior art keywords
- coupling
- mixing
- uhf tuner
- induced
- coupling loop
- 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
- Filters And Equalizers (AREA)
- 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
一第１図は従来のＵＨＦチューナの段間結合回路以降の
回路を示す回路図、第２図は第１図のＵＨＦチューナに
おける高周波段と島部発振段とのトラッキングずれを示
す特性図、第３図は第１図のＵＨＦチューナに於ける高
周波信号の通過帯域幅を説明するための図、第４図はこ
の考案に係るＵＨＦチューナの一実施例を示す回路図、
第５図は第４図のＵＨＦチューナに於ける高周波信号の
通過帯域幅を説明する為の図である。
１１・・・・・・段間複同調回路、１２・・曲混合回路
、１３・・・・・・局部発振回路、１４・・・・・・出
力同調回路、１５、・・・・・・映像中間周波信号の出
力端子、１１３゜１３３・・・・・・共振線路、１２１
・・・・・・コンデンサ、１２２・・曲エミッタ接地形
の混合用トランジスタ、１２３．１２４・・・・・・結
合ループ、１２６・・・・・・コンデンサ。- Figure 1 is a circuit diagram showing the circuit after the interstage coupling circuit of a conventional UHF tuner; Figure 2 is a characteristic diagram showing tracking deviation between the high frequency stage and the island oscillation stage in the UHF tuner of Figure 1; 3 is a diagram for explaining the passband width of a high frequency signal in the UHF tuner of FIG. 1, and FIG. 4 is a circuit diagram showing an embodiment of the UHF tuner according to this invention.
FIG. 5 is a diagram for explaining the passband width of high frequency signals in the UHF tuner of FIG. 4. 11...Inter-stage double tuning circuit, 12...Tune mixing circuit, 13...Local oscillation circuit, 14...Output tuning circuit, 15... Video intermediate frequency signal output terminal, 113° 133... Resonance line, 121
... Capacitor, 122 ... Mixing transistor with curved emitter ground plane, 123.124 ... Coupling loop, 126 ... Capacitor.
Claims (1)
と同じく誘電結合により局部発振信号が誘起される第２
結合ループとを有し、これＬ−）２つの結合ループに誘
起された２つの信号をエミッタ接地形の混合用トランジ
スタのベースに注入して混合することにより映像中間周
波信号を得るような混合回路を有するＵＨＦチューナに
於いて、前記第１結合ループと前記混合用トランジスタ
のベース間に微小容量のコンデンサを挿入したことを特
徴とするＵＨＦチューナ。Similarly to the first coupling loop where a high frequency signal is induced by inductive coupling, the second coupling loop where a local oscillation signal is induced by inductive coupling.
A mixing circuit which has a coupling loop and obtains a video intermediate frequency signal by injecting and mixing two signals induced in the two coupling loops into the base of a mixing transistor with a grounded emitter. 1. A UHF tuner having a microcapacitance capacitor inserted between the first coupling loop and the base of the mixing transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14440481U JPS5848149U (en) | 1981-09-29 | 1981-09-29 | UHF tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14440481U JPS5848149U (en) | 1981-09-29 | 1981-09-29 | UHF tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5848149U true JPS5848149U (en) | 1983-03-31 |
Family
ID=29937368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14440481U Pending JPS5848149U (en) | 1981-09-29 | 1981-09-29 | UHF tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5848149U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6432169U (en) * | 1987-08-20 | 1989-02-28 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS438649Y1 (en) * | 1965-04-06 | 1968-04-17 |
-
1981
- 1981-09-29 JP JP14440481U patent/JPS5848149U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS438649Y1 (en) * | 1965-04-06 | 1968-04-17 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6432169U (en) * | 1987-08-20 | 1989-02-28 |
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