JPS6055713A - Filter circuit - Google Patents
Filter circuitInfo
- Publication number
- JPS6055713A JPS6055713A JP16324583A JP16324583A JPS6055713A JP S6055713 A JPS6055713 A JP S6055713A JP 16324583 A JP16324583 A JP 16324583A JP 16324583 A JP16324583 A JP 16324583A JP S6055713 A JPS6055713 A JP S6055713A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- diode
- terminal
- band
- agc
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/165—Equalizers; Volume or gain control in limited frequency bands
Landscapes
- Filters And Equalizers (AREA)
- Attenuators (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明はテレビジョン信号等の信号帯域を複数の信号帯
域に分割して受信するチューナ等のフィルタ回路に係シ
、特に利得減衰を得るのに好適なフィルタ構成に関する
。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a filter circuit such as a tuner that divides a signal band such as a television signal into a plurality of signal bands and receives the signal, and particularly relates to a filter circuit for obtaining gain attenuation. Regarding preferred filter configurations.
第１図にダイオードによシ受信帯域の切シ換えを行う複
数のフィルタよ構成るフィルタ回路を示す。１は信号入
力端子、２は信号出力端子５、Ａ、５および６はそれぞ
れ帯域切シ換え用電源端子、７はバイパスフィルタ、８
，９．１０はそれぞれバンドパスフィルタ、１１〜２ｏ
は切シ換え用ダイオード、２１〜２８は抵抗器、２９〜
３５は高周波接地用コンデンサである。FIG. 1 shows a filter circuit composed of a plurality of filters that switch reception bands using diodes. 1 is a signal input terminal, 2 is a signal output terminal 5, A, 5 and 6 are power supply terminals for band switching, 7 is a bypass filter, 8
, 9.10 are band pass filters, 11 to 2o, respectively.
is a switching diode, 21-28 are resistors, 29-
35 is a high frequency grounding capacitor.
このフィルタ回路は５０〜９００ＭＨｚの帯域のテレビ
信号を分割して受信するためのチューナの入力部に設け
られたフィルタ回路で、バイパスフィルタ７は第２図に
示した様な回路構成で、５６は信号入力端子、３７は信
号出力端子、６８〜４２はコンデンサ、８．４４はコイ
ルである。バンドパスフィルタ８，９．１０は第３図に
示した様な回路構成で、４５は信号入力端子、４６は信
号出力端子、４７〜５０はコンデンサ、５１〜５３はコ
イルでアル。バンドパスフィルタ１０の通過帯域は５０
〜９０ＭＨｚ、バンドパスフィルタ９の通過帯域ハ１０
ＬＩ〜１７０ ＭＨｚ 、バンドパスフィルタ８０通過
帯域ハ１７０〜２７０ ＭＨｚ 、バイパスフィルタ７
の通過帯域は２７０〜９ｏＯＭＨｚである。This filter circuit is a filter circuit installed at the input section of a tuner for dividing and receiving television signals in the band of 50 to 900 MHz.The bypass filter 7 has a circuit configuration as shown in FIG. A signal input terminal, 37 is a signal output terminal, 68 to 42 are capacitors, and 8.44 is a coil. The bandpass filters 8, 9, and 10 have a circuit configuration as shown in FIG. 3, where 45 is a signal input terminal, 46 is a signal output terminal, 47 to 50 are capacitors, and 51 to 53 are coils. The passband of the bandpass filter 10 is 50
~90MHz, passband of bandpass filter 9 10
LI ~ 170 MHz, band pass filter 80 pass band C 170 ~ 270 MHz, bypass filter 7
The passband of is 270-9oOMHz.
たとえば、１００〜１７０■ｔのバンドパスフィルタの
通過帯域の信号を受信しようとする場合帯域切り換え用
電源端子５に正の電圧を印加しダイオード１５ 、１６
、１９ 、２０を導通状態として、他のダイオードを
すべて非導通状態とし゛Ｃ１信号入力端子１からの信号
をバンドパスフィルタ９を介して出力端子２から出力し
、所望の信号を得る。ダイオードが非導通となる時に各
ダイオードに均一な逆バイアスが印加される様に各ダイ
オードには通常、並列に高抵抗（ｉｏｏ ＫＱ程度）が
接続されるが、ここでは省略する。フィルタ８および１
０を介して信号を選択する場合も同様な作用で受信する
。２７０〜９００■ｔの信号帯域を受信する場合は、電
源端子５に正の電圧を印加し、抵抗２１および２２を介
してダイオード１１を導通状態とし、抵抗２４および２
５を介してタイオート１２を導通状態とし、他のダイオ
ードはすべて非導通状態とする。For example, when trying to receive a signal in the pass band of a bandpass filter of 100 to 170 t, a positive voltage is applied to the band switching power supply terminal 5 and the diodes 15 and 16
. Usually, a high resistance (about IOO KQ) is connected in parallel to each diode so that a uniform reverse bias is applied to each diode when the diode becomes non-conductive, but this is omitted here. Filters 8 and 1
When selecting a signal via 0, reception is performed in a similar manner. When receiving a signal band of 270 to 900 t, apply a positive voltage to the power supply terminal 5, make the diode 11 conductive through the resistors 21 and 22, and connect the resistors 24 and 2.
The tie auto 12 is made conductive through the diode 5, and all other diodes are made non-conductive.
ここでは電源電圧端子には正の電圧を印加するか開放に
することで受信帯域を切シ換えているため、各帯域の通
過帯域の減衰度を変化させることはせずに通過帯域の損
失をできるだけ少なくし、帯域外の減衰度をできるだけ
大きくすることを目的にしている。したがって、ＡＧＣ
による利得減衰が必要な時には、このフィルタの次段に
ＰＩＮダイオード等で構成した可変減衰器を併用するか
、あるいはＡＧＣ動作が可能なＲＦ増幅器が必費である
。Here, the reception band is switched by applying a positive voltage to the power supply voltage terminal or leaving it open, so the loss in the passband is reduced without changing the degree of attenuation in the passband of each band. The purpose is to minimize the amount of noise and increase the degree of attenuation outside the band as much as possible. Therefore, AGC
When gain attenuation is required, it is necessary to use a variable attenuator composed of a PIN diode or the like in the next stage of this filter, or to use an RF amplifier capable of AGC operation.
本発明の目的はＡＧＣによシ通過帯域内の利得減衰量を
変化し得るフィルタ回路を提供することにある。An object of the present invention is to provide a filter circuit that can change the amount of gain attenuation within the passband by AGC.
本発明は、ダイオードを導通あるいは非導通状態にする
ことで複数に分割した信号帯域に相当する複数のフィル
タのうちの一つを選択して信号を通過させるフィルタ回
路の導通状態のダイオードの動作電流をＡＧＣ信号によ
シ変化させ、通過帯域の減衰量を変化させることにした
ものである。The present invention relates to an operating current of a diode in a conductive state in a filter circuit that selects one of a plurality of filters corresponding to a plurality of divided signal bands and passes a signal by making the diode conductive or non-conductive. is changed by the AGC signal to change the amount of attenuation in the passband.
本発明の実施例によるフィルタ回路の回路図を第４図に
示す。第４図において、第１図と同様の作用の要素は同
一番号を付し、説明は省略する。A circuit diagram of a filter circuit according to an embodiment of the present invention is shown in FIG. In FIG. 4, elements having the same functions as those in FIG. 1 are denoted by the same numbers, and explanations thereof will be omitted.
５６は高周波接地コンデンサ、 ５７ 、５８はダイオ
ード、５９は抵抗器、６０は電源端子、６１は６４はト
ランジスタ、６５〜７２は抵抗器、７３〜７６は第１図
の３〜６の帯域切シ換え用電源端子に相当する電源端子
、７７はＡＧＣ信号印加端子である。56 is a high frequency grounding capacitor, 57 and 58 are diodes, 59 is a resistor, 60 is a power supply terminal, 61 is a transistor, 64 is a transistor, 65 to 72 are resistors, and 73 to 76 are band cutting switches 3 to 6 in FIG. A power supply terminal 77 corresponds to a replacement power supply terminal, and 77 is an AGC signal application terminal.
受信しようとする信号帯域の帯域切シ換え用電源端子に
印加する電圧をトランジスタ６１〜６４を介して端子７
７に印加したＡＧＣ信号によシ変化させることでダイオ
ード１１〜１Ｂに流れる電流を変化させ、ダイオード１
１〜１Ｂのインピーダンスを変える。この時、同時にダ
イオード１１〜１８を流れる電流が変わることで信号入
力端子および信号出力端子２の電圧が変化し、これによ
って端子６０に印加された電圧で抵抗５９と２１あるい
は２５を介してダイオード５７あるいはダイオード５８
を流れる電流が変化する。この結果、ダイオードによっ
て減衰量を変化させることができるさらに、ダイオード
１１ 、１３ 、１５ 、１９のうちの導通状態のダイ
オ−Ｆのインピーダンスとダイオミド５７のインピーダ
ンスをそれぞれ最適化することで信号入力端子における
入力ＶＳＷＲを＃１は一定の値に保つことが可能となる
。また、出力端子におけるＶＳＷＲも同様の理由によ）
良好ならしめることができる。The voltage applied to the band switching power supply terminal for the signal band to be received is applied to the terminal 7 via transistors 61 to 64.
The current flowing through the diodes 11 to 1B is changed by changing the AGC signal applied to the diode 1.
Change the impedance of 1 to 1B. At this time, the voltages at the signal input terminal and signal output terminal 2 change as the current flowing through the diodes 11 to 18 changes at the same time, and as a result, the voltage applied to the terminal 60 passes through the resistors 59 and 21 or 25 to the diode 57. Or diode 58
The current flowing through changes. As a result, the amount of attenuation can be changed depending on the diode.Furthermore, by optimizing the impedance of the conductive diode F of the diodes 11, 13, 15, and 19 and the impedance of the diode 57, it is possible to change the attenuation at the signal input terminal. The input VSWR #1 can be kept at a constant value. Also, the VSWR at the output terminal is also due to the same reason)
If it is in good condition, it can be confirmed.
入力および出力におけるＶＳＷＲを問題にしない場合は
、ダイオード５７ 、５８は削除することもできる。If VSWR at the input and output is not a concern, diodes 57 and 58 can also be omitted.
なお、本発明に用いるダイオードは低電流動作時に動作
抵抗値が低く、逆バイアス時の端子間容量が少なく、電
流による動作抵抗変化の比較的大きなＰＩＮダイオード
が有効果である。Note that it is effective for the diode used in the present invention to be a PIN diode, which has a low operating resistance value during low current operation, a small inter-terminal capacitance during reverse bias, and a relatively large change in operating resistance due to current.
本発明によれば、利得減衰が可能で入力および出力のＶ
ＳＷＲを良好ならしめるフィルタ回路を実現することが
可能で、ＡＧＣ動作の不費なＲＦ増幅器と組み合せてＡ
ＧＣによる利得減衰を可能にし、また、ＰＩＮダイオー
ドによる可変減衰器を削減することも可能で、回路構成
を簡略化できるとともに、ＲＦ増幅器で発生する妨害特
性の抑圧にも効果がある。According to the present invention, gain attenuation is possible and input and output V
It is possible to realize a filter circuit that improves SWR, and by combining it with an RF amplifier that does not require AGC operation.
It is possible to attenuate the gain by GC, and it is also possible to eliminate the variable attenuator using a PIN diode, which simplifies the circuit configuration and is also effective in suppressing the interference characteristics generated in the RF amplifier.
第１図ζオスイツチングダイオードで帯域切シ換えを行
なうル分割フィルタから成るフィルタ回路、第２図はノ
ーイバスフィルタの回路図、第３図はバンドパスフィル
タの回路図、第６図は本発明の実施例を示すフィルタ回
路図である。
１・・・信号入力端子、
２・・・信号出力端子、
５、Ａ、５．６・・・帯域切り換え用電源端子、７・・
・バイパスフィルタ、
８．９．ＩＱ・・・バンドパスフィルタ、１１〜１１Ｌ
、 ５７ 、５８・・・ダイオード、６０・・・電源端
子、
６１χ６Ａ・・・トランジスタ、
７３〜７６・・・帯域切シ換え用電源端子、７７・・・
ＡＧＯ信号印加端子。
代理人弁理士 高 橋 明 夫
才 １ 図
第２ｍ
４、 ｙ ｒ、ｊ”−’ｙ４２
才３図Figure 1 is a filter circuit consisting of a split filter that performs band switching using a zeta switching diode, Figure 2 is a circuit diagram of a no-bus filter, Figure 3 is a circuit diagram of a band pass filter, and Figure 6 is a circuit diagram of a bandpass filter. 1 is a filter circuit diagram showing an embodiment of the invention. FIG. 1... Signal input terminal, 2... Signal output terminal, 5, A, 5.6... Power supply terminal for band switching, 7...
・Bypass filter, 8.9. IQ...Band pass filter, 11~11L
, 57, 58...diode, 60...power supply terminal, 61χ6A...transistor, 73-76...power supply terminal for band switching, 77...
AGO signal application terminal. Representative Patent Attorney Akio Takahashi 1 Figure 2m 4, y r, j"-'y42 y 3
Claims (1)
るために、各信号帯域毎に設けた複数のフィルタの信号
入力端子をダイオードを介してそれぞれ信号入力端−子
に接続し、さらに該複数のフィルタの信号出力端子をダ
イオードを介してそれぞれ信号出力端子に接続し、複数
のフィルタのうちの受信すべき信号帯域に相当する入力
端子および出力端子のそれぞれのダイオードを導通状態
にし、ダイオードに流れる電流をＡＧＣ信号によ多制御
するとともに、該ダイオードに流れる電流によシ、動作
電流が制御されるダイオードを信号入力端子および信号
出力端子と接地間に高周波的に接続したことを特徴とす
るフィルタ回路。1. In order to receive one signal band out of a plurality of signal bands, the signal input terminals of a plurality of filters provided for each signal band are connected to the respective signal input terminals via diodes, and The signal output terminals of multiple filters are connected to the signal output terminals through diodes, and the diodes of the input and output terminals corresponding to the signal band to be received among the multiple filters are made conductive. The current flowing through the diode is controlled by an AGC signal, and a diode whose operating current is controlled by the current flowing through the diode is connected at high frequency between the signal input terminal, the signal output terminal, and the ground. filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16324583A JPS6055713A (en) | 1983-09-07 | 1983-09-07 | Filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16324583A JPS6055713A (en) | 1983-09-07 | 1983-09-07 | Filter circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6055713A true JPS6055713A (en) | 1985-04-01 |
| JPH0339406B2 JPH0339406B2 (en) | 1991-06-13 |
Family
ID=15770110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16324583A Granted JPS6055713A (en) | 1983-09-07 | 1983-09-07 | Filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6055713A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63144722U (en) * | 1987-03-16 | 1988-09-22 | ||
| JPH046571U (en) * | 1990-04-27 | 1992-01-21 |
-
1983
- 1983-09-07 JP JP16324583A patent/JPS6055713A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63144722U (en) * | 1987-03-16 | 1988-09-22 | ||
| JPH0514572Y2 (en) * | 1987-03-16 | 1993-04-19 | ||
| JPH046571U (en) * | 1990-04-27 | 1992-01-21 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0339406B2 (en) | 1991-06-13 |
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