JPS6065634A - Tuner device - Google Patents
Tuner deviceInfo
- Publication number
- JPS6065634A JPS6065634A JP58174911A JP17491183A JPS6065634A JP S6065634 A JPS6065634 A JP S6065634A JP 58174911 A JP58174911 A JP 58174911A JP 17491183 A JP17491183 A JP 17491183A JP S6065634 A JPS6065634 A JP S6065634A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- input
- tuner
- fed
- high 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、テレビジョン受像機等のチューナー装置に関
する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tuner device for a television receiver or the like.
従来例の構成とその問題点
第１図に従来例を示して説明すると、アンテナ１に誘起
された信号は広帯域高周波増幅回路２で増幅され同軸ケ
ーブル８を介してチューナー７゜映像中間周波増幅回路
６へと供給される。寸だチューナー７は高周波増幅回路
３．混合回路４１局部発振回路らから構成される。ここ
で高周波増幅回路３は受信希望チャンネルの信号だけを
増幅する回路で、ある一定の帯域を持ち、混合回路４は
高周波増幅回路３で増幅された映像と音声の両搬送波を
中間周波数に変換する回路であり、局部発振回路５は混
合回路４に周波数変換用の信号を供給する回路である。Configuration of the conventional example and its problems To explain the conventional example shown in FIG. 1, the signal induced in the antenna 1 is amplified by the broadband high frequency amplification circuit 2 and then sent to the tuner 7 through the coaxial cable 8 and the video intermediate frequency amplification circuit. 6. The tuner 7 is a high frequency amplifier circuit 3. The mixing circuit 41 is composed of a local oscillation circuit and others. Here, the high frequency amplification circuit 3 is a circuit that amplifies only the signal of the desired reception channel and has a certain band, and the mixing circuit 4 converts both the video and audio carrier waves amplified by the high frequency amplification circuit 3 to an intermediate frequency. The local oscillation circuit 5 is a circuit that supplies a signal for frequency conversion to the mixing circuit 4.
一般的に感度及びＳ／Ｎ 向上を目的とした広帯域高周
波増幅回路２はチューナー単体７とは別に単独で構成さ
れた同軸ケーブル８を介してチューナー７に接続される
ため、チューナー７０入力端で広帯域高周波増幅回路２
の特性をみた場合、単独での特性より劣る。またアンテ
ナ１に誘起された信号は広帯域高周波増幅回路２で増幅
されるため、大入力が入った場合混変調妨害を生じる。In general, a broadband high-frequency amplifier circuit 2 for the purpose of improving sensitivity and S/N is connected to the tuner 7 via a coaxial cable 8 that is configured separately from the tuner unit 7. High frequency amplifier circuit 2
When looking at the characteristics of , it is inferior to the characteristics of alone. Further, since the signal induced in the antenna 1 is amplified by the wideband high frequency amplifier circuit 2, cross-modulation interference occurs when a large input is applied.
発明の目的
本発明は受信周波数全帯域にわたってチューナーの感度
、雑音指数を向上させ、大入力時における混変調妨害を
除去するものである。OBJECTS OF THE INVENTION The present invention improves the sensitivity and noise figure of a tuner over the entire receiving frequency band, and eliminates cross-modulation interference at the time of large input.
発明の構成
本発明においては、広帯域高周波増幅回路をチューナー
の同一基板上に構成し感度、雑音指数を向」−さぜ、広
帯域高周波増幅回路の直流電圧供給ラインに、この直流
電圧をオン・オフするためのスイッチ用の端子を設けて
いる。これにより、大入力時には広帯域高周波増幅回路
の直流電圧をオフにして減衰器として働かせることによ
り混変調妨害を除去するものである。Structure of the Invention In the present invention, a broadband high-frequency amplifier circuit is configured on the same board as the tuner to improve sensitivity and noise figure. A terminal for a switch is provided for this purpose. As a result, at the time of a large input, the DC voltage of the broadband high-frequency amplifier circuit is turned off and the circuit functions as an attenuator, thereby eliminating cross-modulation interference.
実施例の説明
以下本発明の一実施例を第２図、第３図を用いて説明す
る。なお、第２図中、第１図の各部と同一機能を持つ回
路には同一番号を付している。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In FIG. 2, circuits having the same functions as those in FIG. 1 are given the same numbers.
第２図において基本回路構成は第１図と同様である。第
１図と異なる点は、広帯域高周波増幅回路２をチューナ
ー９の同一基板上に構成して直接装着し、広帯域高周波
増幅回路２と高周波増幅回路３との間の同軸ケーブルを
除去するようにし、さらに、その高周波増幅回路３への
電源のオン・オフ用スイッチＳＷを設けたことである。The basic circuit configuration in FIG. 2 is the same as that in FIG. 1. The difference from FIG. 1 is that the wideband high-frequency amplification circuit 2 is configured and directly mounted on the same board of the tuner 9, and the coaxial cable between the wideband high-frequency amplification circuit 2 and the high-frequency amplification circuit 3 is removed. Furthermore, a switch SW for turning on/off the power to the high frequency amplifier circuit 3 is provided.
この結果、受信周波数全帯域にわたってチューナーの主
性能である感度、雑音指数を向上できる。As a result, the sensitivity and noise figure, which are the main performance of the tuner, can be improved over the entire receiving frequency band.
寸だ、第３図に広帯域高周波増幅回路の一実施例の回路
を示す。アンテナに誘起された信号はバルンＬ１でイン
ピーダンス整合され入力整合回路１ｏを経由して、トラ
ンジスタＱ１のベースに供給される。通常動作時は端子
Ａ、Ｂけ短絡され、→−Ｂ電圧は抵抗Ｒｉ、Ｒ３で分割
されトランジスタＱ１のベースに印加されるため、この
トランジスタＱ７が導通して例えば２０ｄＢ増幅された
出力が出力整合トランスＴ１．結合コンデンサＣ３を経
由して、入力同調回路１１．高周波増幅回路１２へと供
給される。Figure 3 shows an example of a broadband high frequency amplifier circuit. The signal induced in the antenna is impedance matched by the balun L1, and is supplied to the base of the transistor Q1 via the input matching circuit 1o. During normal operation, terminals A and B are short-circuited, and the -B voltage is divided by resistors Ri and R3 and applied to the base of transistor Q1, so transistor Q7 is conductive and the output amplified by, for example, 20 dB is output matched. Transformer T1. Via the coupling capacitor C3, the input tuning circuit 11. The signal is supplied to the high frequency amplification circuit 12.
次に大入力が入力されてきた場合には、端子Ａ。Next, when a large input is input, terminal A is input.
Ｂを開放してトランジスタＱ１をオフにする。これによ
り、アンテナに誘起された信号はバルンＬ１でインピー
タンス整合され、入力整合回路１０゜負帰還抵抗Ｒ１，
コ出力整合トランス整合トランスＴ１．結合コンデンサ
Ｃ３を経由して、入力同調回路１１．高周波増幅回路１
２へと供給される。この時、負帰還抵抗Ｒ１は例えば１
４ｄＢの減衰器として働く。これによって、混変調妨害
を除去することができる。B is opened to turn off transistor Q1. As a result, the signal induced in the antenna is impedance matched by the balun L1, and the input matching circuit 10° negative feedback resistor R1,
Output matching transformer Matching transformer T1. Via the coupling capacitor C3, the input tuning circuit 11. High frequency amplifier circuit 1
2. At this time, the negative feedback resistor R1 is, for example, 1
Acts as a 4dB attenuator. This allows cross-modulation interference to be removed.
発明の効果
以上の説明により明らか外ように、本発明によれば、広
帯域高周波増幅回路をチューナーに直接装着して構成し
かつその高周波増幅回路への電源をオン・オフするスイ
ッチを設けることにより、感度、雑音指数及び作業性を
向上させ、大入力に対しては広帯域高周波増幅回路を減
衰器として働かせ混変調妨害を防ぐことができて、実用
上極めて効果的である。Effects of the Invention As is clear from the above explanation, according to the present invention, by configuring a broadband high-frequency amplification circuit directly attached to a tuner and providing a switch for turning on and off the power to the high-frequency amplification circuit, It improves sensitivity, noise figure, and workability, and for large inputs, the broadband high-frequency amplifier circuit works as an attenuator to prevent cross-modulation interference, which is extremely effective in practice.
第１図は従来例におけるチューナー装置のブロック図、
第２図は本発明の一実施例におけるチューナー装置のブ
ロック図、第３図は同チューナー装置の広帯域高周波増
幅回路の回路図である。
２・・・・・広帯域高周波増幅回路、３・・・・・・高
周波増幅回路、４・・混合回路、５・・・・・局部発振
回路、９ ・・チューナー、ＳＷ・・・・・スイッチ。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図
し− ＵFIG. 1 is a block diagram of a conventional tuner device,
FIG. 2 is a block diagram of a tuner device according to an embodiment of the present invention, and FIG. 3 is a circuit diagram of a broadband high-frequency amplification circuit of the tuner device. 2...Broadband high frequency amplification circuit, 3...High frequency amplification circuit, 4...Mixing circuit, 5...Local oscillation circuit, 9...Tuner, SW...Switch . Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 - U
Claims (1)
広帯域高周波増幅回路の直流電圧供給ラインにこの直流
電圧の供給を切換えるスイッチ用の端子を設けたチュー
ナー装置。A tuner device in which a broadband high-frequency amplifier circuit is directly attached to the tuner, and a terminal for a switch for switching the supply of DC voltage is provided on the DC voltage supply line of the broadband high-frequency amplifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58174911A JPS6065634A (en) | 1983-09-20 | 1983-09-20 | Tuner device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58174911A JPS6065634A (en) | 1983-09-20 | 1983-09-20 | Tuner device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6065634A true JPS6065634A (en) | 1985-04-15 |
Family
ID=15986848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58174911A Pending JPS6065634A (en) | 1983-09-20 | 1983-09-20 | Tuner device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6065634A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716500A (en) * | 1993-06-30 | 1995-01-20 | Seiichi Kitabayashi | Foam discharging device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57173210A (en) * | 1981-04-18 | 1982-10-25 | Pioneer Electronic Corp | Antenna receiving and inputting circuit |
-
1983
- 1983-09-20 JP JP58174911A patent/JPS6065634A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57173210A (en) * | 1981-04-18 | 1982-10-25 | Pioneer Electronic Corp | Antenna receiving and inputting circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716500A (en) * | 1993-06-30 | 1995-01-20 | Seiichi Kitabayashi | Foam discharging device |
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