JPS58123217A - Filter circuit - Google Patents
Filter circuitInfo
- Publication number
- JPS58123217A JPS58123217A JP505482A JP505482A JPS58123217A JP S58123217 A JPS58123217 A JP S58123217A JP 505482 A JP505482 A JP 505482A JP 505482 A JP505482 A JP 505482A JP S58123217 A JPS58123217 A JP S58123217A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- trap
- filter
- channel selection
- input
- 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
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1791—Combined LC in shunt or branch path
Landscapes
- Filters And Equalizers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、ＣＡ’ｆ’Ｖ（ケーブルテレビ）用コンパー
タチ、−す等に用いられる広帯域人力バンドパスフィル
タ回路に関する□。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wideband manual bandpass filter circuit used in CA'f'V (cable television) converters, etc.
従来の広帯域入力フィルタは、チ、−す入力端子に到達
した信号全数を１減衰させることなく、該フィルタに接
続されたＲＦ増幅器、或いは、周波数変換器に供給する
ため、前記ＲＰ増５ｉｌｆＦ、或いは周波数変換器にお
いて、多波入力による相互ｉｌｌ歪と混変調妨害の劣化
を生ずるという欠点があった。Conventional wideband input filters use the RP amplification 5ilfF or In the frequency converter, there is a drawback that deterioration due to mutual illumination distortion and cross-modulation interference due to multi-wave input occurs.
本発明の目的は、前記した技来技術の欠点をなくシ、相
互変調歪と混変調妨害の改善を考慮した入力フィルタを
提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an input filter that eliminates the drawbacks of the prior art described above and takes into account improvements in intermodulation distortion and intermodulation interference.
チ、−すの入力端に到達した信号は、大力フィルタを通
過し、非直線要素の１６−周波数変換器、或いはＲＦ増
幅器に入力される。一般に、前記非直線回路は、種々の
歪を包含しており、入力される信号数が、ｎ波の時には
、２波入力されたときに比して相互変調歪で１ ｏｆＬ
ｏｇ （ｎ−１） ｄＢ 、混変調妨害で２０ｉｏｇ（
ｎ−リｄＢ歪成分の強度が劣化する。従って、非直線回
路へ入力される信号数を減少せしめれば、相互変調歪、
混変調妨害等の各種企の改善が得らｎる。The signal reaching the input end of the circuit passes through a high-power filter and is input to a 16-frequency converter or RF amplifier, which is a non-linear element. Generally, the non-linear circuit includes various types of distortion, and when the number of input signals is n waves, the intermodulation distortion is 1 of L compared to when 2 waves are input.
og (n-1) dB, 20 iog(
The intensity of the n-Li dB distortion component deteriorates. Therefore, if the number of signals input to the nonlinear circuit is reduced, intermodulation distortion,
Various problems such as cross-modulation interference can be improved.
そこで、本発明の）ゞイルタは、広帯域バンドフィルタ
円の信号経路と接地電子間に、インダクタンスと容量と
可変容量ダイオードの直列接続よりなるトラップ回路を
少くと１１１！１以上付加接続し。Therefore, the filter of the present invention additionally connects at least 111!1 trap circuits each consisting of an inductance, a capacitance, and a variable capacitance diode connected in series between the signal path of the broadband band filter circle and the ground electron.
かつ前記可変容量ダイオードにチャンネル選局電圧を印
加することによｆｉ）ラップ回路の共振周波数ｔ′変化
せしめ金ように構成するものである。By applying a channel selection voltage to the variable capacitance diode, the resonant frequency t' of the wrap circuit is changed.
以下１本発明の一実施例を第１図、第２図及び９５図に
より説明する。An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 95.
第１図は本発明の回路構成図である。図において１は本
発明にするフィルタを示し、２は従来より用いられてい
る広帯域バンドフィルタ、３は周波数変換齢等の非直線
回路を示し、４は本発明の特徴とするトラップ回路を示
す。パスフィルタ２に、インダクタンスＬ１．Ｌ２、容
量Ｃ１＃Ｃ２可変容量ダイオードＤ１＃Ｄ２が、それぞ
れ図示の如く直列接続されたトラップ回路４′Ｐｔ付加
するものである。このトラップ回路４のアドミッタンス
９は、（促し％ ０ｍ−２’ ｆ ａ ＣＹ １ ａ
ＣＶ ２はＤ１１Ｄ２の容量］で表わされるので、トラ
ップ回路４の伝送特性は、ｆｏｌ”” Ｆ；正τフ；宴
Ｗ／２ト・・・・・・・・・・・・・・・凹曲（２）ｆ
ｏ ２ｑ石正賛評砂漬７２Ｋ・・・・・・・・・・・・
・・・・・・・・・・・・（３）において、直列共振し
て、第２図に示すような。FIG. 1 is a circuit diagram of the present invention. In the figure, 1 indicates a filter according to the present invention, 2 indicates a conventional wide band filter, 3 indicates a non-linear circuit such as a frequency conversion circuit, and 4 indicates a trap circuit which is a feature of the present invention. The pass filter 2 has an inductance L1. L2, capacitors C1 and C2, variable capacitance diodes D1 and D2 are added to trap circuits 4'Pt connected in series, respectively, as shown. The admittance 9 of this trap circuit 4 is (% 0m-2' fa CY 1 a
Since CV 2 is expressed as the capacitance of D11D2], the transmission characteristic of the trap circuit 4 is fol""F; positive τ; Song (2) f
o 2q stone positive review sand pickle 72K・・・・・・・・・・・・
In (3), series resonance occurs as shown in FIG.
トラップ特性を有する。このトラップ特性は、チャンネ
ル選局電圧Ｖ！ によって、 ＣｖｔｓＣｖｚが変化す
るので、式（２） 、 （Ａ）より、共振周波数ｆｏ１
．ｆｏ＊は、リニアに変化する。Has trapping properties. This trap characteristic is based on the channel selection voltage V! Since CvtsCvz changes, from equations (2) and (A), the resonant frequency fo1
．． fo* changes linearly.
広帯域フィルタ２とトラップ回路４を接続したフィルタ
１の伝送特性は、低域チャンネル受信時には第３図（ａ
）となり、中域チャンネル、高域チャンネル受信時には
、そｎぞれ、同図（ｂ） 、 （０１七なる。The transmission characteristics of filter 1, which connects broadband filter 2 and trap circuit 4, are as shown in Figure 3 (a) when receiving a low frequency channel.
), and when receiving the mid-range channel and high-range channel, the values are (b) and (017), respectively.
このようにトラップ回路４な付加することによりて、フ
ィルタ１０通過帯域暢を狭くすることが可能となり、非
直線回路３への入力信号数を、受信信号に影響を与える
ことなく、少なくでき、それに伴ない、多信号入力によ
る相互変調歪、混変調妨害等の妨害特性の改善が可能と
なる。By adding the trap circuit 4 in this way, it is possible to narrow the passband of the filter 10, and the number of input signals to the nonlinear circuit 3 can be reduced without affecting the received signal. Accordingly, it becomes possible to improve interference characteristics such as intermodulation distortion and cross-modulation interference due to multi-signal input.
本発明によれば、□・１、非直線回路に入力される信号
数ヶ減ｂｆｃよ、８ユ能よ、。ア、多信号いヵ、
１よる相互変調歪、混変調妨害等の妨害特性の改善の
効果がある。According to the present invention, □・1, the number of signals input to the nonlinear circuit is reduced, and the number of signals input to the nonlinear circuit is reduced to 8 units. A, there are many signals.
This has the effect of improving interference characteristics such as intermodulation distortion and cross-modulation interference caused by 1.
第１図蚤工１本発明の一実施例の回路、第２因はトラッ
プ回路部の伝送特性１、第３図（ａＬ（ｂＭｏ）は本発
明の一実施例の総合伝送特性を示す図である。
符号の説明
１・・・大力フィルタ％ ２・・・広帯域イ（ンドパス
フィルタ、ト・・非直線回路、４・・・トラップ回路、
Ｌ、。
Ｌ２・・・インダクタンス、Ｃ１５ｃ２・・・容量％Ｄ
１１Ｄ２・・・可変容量ダイオード、ａ・・・抵抗す
１ 図
米 ２［１Figure 1 shows a circuit of an embodiment of the present invention, the second factor is the transmission characteristic 1 of the trap circuit section, and Figure 3 (aL (bMo)) is a diagram showing the overall transmission characteristic of an embodiment of the present invention. Explanation of symbols 1... Large power filter % 2... Wide band pass filter, G... Non-linear circuit, 4... Trap circuit,
L. L2...Inductance, C15c2...Capacity%D
11D2... Variable capacitance diode, a... Resistor
1 Zumei 2 [1
Claims (1)
成された広帯域バンドパスフィルタにおいて、該フィル
タ円の信号経路と接地電子間に、インダクタンスと容量
と可変容量ダイオードの直列接続よりなる厘、列共振！
路を少くと％１個以上付加接続し、かつ前記可変容量ダ
イオードにチャンネル選局電圧を印加することにより前
記直列共振回路の共振周波数を変化せしめるように構成
したことｔ特徴とするフィルタ回路。In the broadband bandpass filter formed in the cable TV converter input circuit, column resonance occurs between the signal path of the filter circle and the ground electron, consisting of a series connection of inductance, capacitance, and variable capacitance diode. !
A filter circuit characterized in that the resonant frequency of the series resonant circuit is changed by additionally connecting at least 1 or more channels and applying a channel selection voltage to the variable capacitance diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP505482A JPS58123217A (en) | 1982-01-18 | 1982-01-18 | Filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP505482A JPS58123217A (en) | 1982-01-18 | 1982-01-18 | Filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58123217A true JPS58123217A (en) | 1983-07-22 |
Family
ID=11600679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP505482A Pending JPS58123217A (en) | 1982-01-18 | 1982-01-18 | Filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58123217A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6187406A (en) * | 1984-10-03 | 1986-05-02 | Matsushita Electric Ind Co Ltd | High frequency amplifier device |
| JPS61179821U (en) * | 1985-04-26 | 1986-11-10 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4842481U (en) * | 1971-09-21 | 1973-05-31 |
-
1982
- 1982-01-18 JP JP505482A patent/JPS58123217A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4842481U (en) * | 1971-09-21 | 1973-05-31 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6187406A (en) * | 1984-10-03 | 1986-05-02 | Matsushita Electric Ind Co Ltd | High frequency amplifier device |
| JPS61179821U (en) * | 1985-04-26 | 1986-11-10 |
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