JPS63193725A - Input circuit for electronic tuner - Google Patents
Input circuit for electronic tunerInfo
- Publication number
- JPS63193725A JPS63193725A JP2453887A JP2453887A JPS63193725A JP S63193725 A JPS63193725 A JP S63193725A JP 2453887 A JP2453887 A JP 2453887A JP 2453887 A JP2453887 A JP 2453887A JP S63193725 A JPS63193725 A JP S63193725A
- Authority
- JP
- Japan
- Prior art keywords
- input
- circuit
- pass filter
- antenna
- diodes
- 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
- 230000001939 inductive effect Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 206010041662 Splinter Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の第１ｊ用分野〕
本発明は電子同調チューナに使用する入力回路に係り、
他物性を劣化させることなく、特に良好なアンテナ耐サ
ージ特性を得る入力回路方式に関する。[Detailed description of the invention] [Industrial field 1j] The present invention relates to an input circuit used in an electronically tuned tuner,
The present invention relates to an input circuit system that obtains especially good antenna surge resistance characteristics without deteriorating other physical properties.
従来は電子同調チューナに入力された信号がＵ／Ｖスプ
リッタ回路１０１こてＶＨＦ帯とＬＩＨＩ−帯に分離さ
れる回路においてＶ）ＩＦ側のローパスフィルタを構成
する容量素子としてコンデンサを使用していた。しかし
前記回路はアンテナ耐サージ特性の点については配慮さ
れていなかった。なお、関連技術としては実開昭６１−
２１１３４号公報があるＯ
〔発明が解決しようとする問題点〕
上記従来技術はアンテナ耐サージ特性の点について配膳
されておらず、サージノイズによるチューナ破壊の問題
があった。Conventionally, a capacitor was used as a capacitive element to constitute a low-pass filter on the V) IF side in a circuit where the signal input to an electronic tuning tuner is separated into the VHF band and the LIHI band by the U/V splitter circuit 101. . However, the above circuit did not take into account the antenna surge resistance characteristics. In addition, as a related technology, Utility Model Application No. 61-
No. 21134 has been published. [Problems to be Solved by the Invention] The above-mentioned conventional technology does not have any provision for antenna surge resistance characteristics, and there is a problem of damage to the tuner due to surge noise.
本発明の目的はチューナ諸特性への影響もなくかつアン
テナ耐サージ特性が向上することにある。An object of the present invention is to improve antenna surge resistance without affecting various tuner characteristics.
上記目的はアンテナ入力端子とアース間にサージノイス
吸収用ダイオードを付加することにより達成される。The above object is achieved by adding a surge noise absorbing diode between the antenna input terminal and ground.
アンテナ耐サージ用ダイオードをアンテナ入力端子、ア
ース間に接続することにより、瞬時にしてサージノイズ
がアースに流れる為、内入力回路に伝達されエネルギー
が大幅に軽減される。その場合接続箇所をＵ／Ｖスプリ
ッタ回路のＶ ＨＦ １１１１０−パスフイルタを構成
するコイルの後に、上記ダイオードを付加することζこ
より、高周仮的に他物性への影響をなくすることが可能
となる０〔実施例〕
以下、本発明の一実施例を図により説明する。By connecting an antenna anti-surge diode between the antenna input terminal and the ground, surge noise instantly flows to the ground and is transmitted to the internal input circuit, significantly reducing energy. In that case, by adding the above diode after the coil that constitutes the VHF 11110-pass filter of the U/V splitter circuit at the connection point, it is possible to temporarily eliminate the influence on other physical properties at high frequencies. 0 [Example] Hereinafter, an example of the present invention will be described with reference to the drawings.
図においてアンテナ入力端子１より入力された信号はＵ
）ｔ Ｆ受信時はコンデンサ２と結合ループ５によっ
て形成されるハイパスフィルタζこてＶ）ＩＦ帝酸成分
減衰されたのちバリキャップダイオード７と共搗コイル
６によって形成される入力ＰＩ ｇ回路を経て結合コン
デンサ９を介して、Ｕ）ｉＦＲＦＡｍｐ、ＦＥＴのゲー
ト１に供給される。また、ＶＨセ゛受信時にはコイル３
、耐サージ用ダイオードのキャパシタンスから形成され
るローパスフィルタを打て、サラにハイパスフィルタ１
０にてＩ Ｆ帯を減衰させた後、ｖＨＦ入力同調回路に
供給される。In the figure, the signal input from antenna input terminal 1 is U
) When receiving F, the high-pass filter ζ formed by the capacitor 2 and the coupling loop 5 V) After the IF component is attenuated, it is passed through the input PI g circuit formed by the varicap diode 7 and the Kyodo coil 6. Via a coupling capacitor 9, it is supplied to the gate 1 of the FET U)iFRFAmp. Also, when receiving VH signals, coil 3
, a low-pass filter formed from the capacitance of the anti-surge diode is installed, and a high-pass filter 1 is installed.
After attenuating the IF band at 0, the signal is supplied to the vHF input tuning circuit.
さて、不回路においてサージノイズ（約ＩＶＩＨｚ）が
入力された場合Ｖｌ（Ｆ受信時（こは入力回路に設けら
れたハイパスフィルタにより軽減されるため、後段への
影響は少ないｏしかし、ＵＨＦ受信時の場合瞬時にして
サージ電圧がストレートにＲＦＡｍｐ。Now, when surge noise (approximately IVIHz) is input in a non-circuit, when receiving Vl(F) (this is reduced by the high-pass filter provided in the input circuit, the influence on the subsequent stage is small).However, when receiving UHF In the case of instantaneous surge voltage goes straight to RF Amp.
に到達する為ＲＦＡｍｐ、 ＦＥ’ｌ’のゲート１に高
圧が加わり破壊される。そこで各入力回路にサージノイ
ズが伝達されない様にアンテナ端子７１）らサージノイ
ズが入った地点でアースに流れ出させる方法をとる。方
法としてアンテナ入力端子に直接２個以上の極性の異な
るダイオードを付加することにより屏決出米るが前記方
法では、ダイオードの容量分（４ＰＦ）によりＵ ＨＦ
帯におけるロスが増加し、特性（Ｖに電力籾得、雑音指
数）が劣化するため好ましくない０そこで、スプリンタ
回路のＶ ｆ（Ｆ ｔＩＩ１１０−バスフィルタのコイ
ルの後に、接続すれば、高周波的にはダイオードのキャ
パシタンスがローパスフィルタのコンデンサを形成する
ことになり特性上問題ない。また、サージノイズなどの
低周波成分が入力された場合、上記ローパスフィルタの
コイルは十分にインピーダンスが小さくなるため、アン
テナ端子ｌこ上記ダイオードを接続したことと等価とな
り、大幅なアンテナ耐サージ特性の向上が図れる。In order to reach this point, high voltage is applied to gate 1 of RFAmp and FE'l', causing it to be destroyed. Therefore, in order to prevent the surge noise from being transmitted to each input circuit, a method is adopted in which the surge noise is caused to flow out to the ground at the point where it enters from the antenna terminal 71). One method is to add two or more diodes with different polarities directly to the antenna input terminal, but in the above method, the U HF
This is undesirable because the loss in the band increases and the characteristics (V, power gain, noise figure) deteriorate.Therefore, if the splinter circuit's V f (F tII110- is connected after the bass filter coil), high frequency The capacitance of the diode forms the capacitor of the low-pass filter, so there is no problem with the characteristics.Also, when low-frequency components such as surge noise are input, the impedance of the coil of the low-pass filter becomes sufficiently small, so This is equivalent to connecting the above diode to the antenna terminal l, and the surge resistance characteristics of the antenna can be greatly improved.
本発明によればｖ／Ｕ１人カタイプの′砥子同調チュー
ナのアンテナ耐サージ特性を約５ＫＶ向上させることが
出来る。その上池特性への影響もなくすることも出来る
。According to the present invention, it is possible to improve the antenna surge resistance characteristic of a V/U one-person type abrasive tuning tuner by about 5 KV. Moreover, it is also possible to eliminate the effect on the characteristics of the pond.
図は、本発明の一実施例のＵ／ｖｉ入カタイカタイプ四
調チューナの入力回路図をボア。
１・・・アンテナ入力端子The figure shows an input circuit diagram of a U/VI input Kataka type four-tone tuner according to an embodiment of the present invention. 1...Antenna input terminal
Claims (1)
ルタを経てＵＨＦ入力同調回路に信号が入力され、ＶＨ
Ｆ受信時にはＵＨＦ信号除去用のローパスフィルタを経
てＶＨＦ入力同調回路に信号が入力されるＶ／Ｕスプリ
ッタ回路を備えたＶ／Ｕ１入力タイプの電子同調チュー
ナにおいて、アンテナ端子とＶＨＦ入力同調回路間に直
列に誘導素子が接続され、かつその接続点とアース間に
容量素子が接続されて成る前記ローパスフィルタにおい
て、容量素子として少なくとも２個以上のダイオードを
互いに極性の異なる様にして構成したことを特徴とする
電子同調チューナの入力回路。1. When receiving UHF, the signal is input to the UHF input tuning circuit through a high-pass filter for VHF signal removal, and the VHF signal is input to the UHF input tuning circuit.
In a V/U1 input type electronic tuning tuner equipped with a V/U splitter circuit, in which the signal is input to the VHF input tuning circuit through a low-pass filter for UHF signal removal during F reception, there is a connection between the antenna terminal and the VHF input tuning circuit. The low-pass filter is characterized in that inductive elements are connected in series and a capacitive element is connected between the connection point and ground, and the capacitive element is composed of at least two or more diodes with different polarities. Input circuit for an electronically tuned tuner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2453887A JPS63193725A (en) | 1987-02-06 | 1987-02-06 | Input circuit for electronic tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2453887A JPS63193725A (en) | 1987-02-06 | 1987-02-06 | Input circuit for electronic tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63193725A true JPS63193725A (en) | 1988-08-11 |
Family
ID=12140926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2453887A Pending JPS63193725A (en) | 1987-02-06 | 1987-02-06 | Input circuit for electronic tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63193725A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010057332A (en) * | 2008-08-29 | 2010-03-11 | Dx Antenna Co Ltd | Surge protection circuit and high-frequency equipment having the same |
-
1987
- 1987-02-06 JP JP2453887A patent/JPS63193725A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010057332A (en) * | 2008-08-29 | 2010-03-11 | Dx Antenna Co Ltd | Surge protection circuit and high-frequency equipment having the same |
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