JPS60130911A - Fdnr type filter - Google Patents
Fdnr type filterInfo
- Publication number
- JPS60130911A JPS60130911A JP58239576A JP23957683A JPS60130911A JP S60130911 A JPS60130911 A JP S60130911A JP 58239576 A JP58239576 A JP 58239576A JP 23957683 A JP23957683 A JP 23957683A JP S60130911 A JPS60130911 A JP S60130911A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- capacitor
- operational amplifier
- circuit
- series
- 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
- H03H11/00—Networks using active elements
- H03H11/46—One-port networks
- H03H11/52—One-port networks simulating negative resistances
- H03H11/525—Simulating frequency dependent negative resistance [FDNR]
Landscapes
- Networks Using Active Elements (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、 ｌ’ＤＮＲ回路を用いたフィルター、例エ
バ、コンバクトディスクプレヤ−，ＰＯＭオーディオ、
ＰＯＭ通信などの信号の入出力段に用いて好適なアクテ
ィブフィルターに関する。更に詳しくは、−１Ｓ（ω＝
２πｆ、ｆ：周波数）に比例したインピーダンスを持つ
素子、いわゆるＦｌ）ＮＲ（Ｆｒｅ−ｑｕｅｎｃｙ Ｄ
（！ｐｅｎｄｃｒＦｔ ＮｅｇａｉｌＶｅ １ＬａｓＩ
ｓｊａｎｃｅ） を用いたアクティブフィルターに関す
る。Detailed Description of the Invention (Technical Field of the Invention) The present invention relates to a filter using an l'DNR circuit, a compact disk player, a POM audio,
The present invention relates to an active filter suitable for use in a signal input/output stage such as POM communication. More specifically, −1S(ω=
2πf, f: an element with impedance proportional to frequency), so-called Fl)NR (Frequency D
(!pendcrFt NegailVe 1LasI
sjance).
（ＦＤＮａ！！！！フィルターの説明）例えば、５次有
極形はしご型低域フィルターをコイルとコンデンサーで
構成すると第１図に示すようになる。図において、（１
）は信号入力端、（２）は信号出力端、Ｒｇ、 Ｌ、、
Ｌ、、 Ｌ、は信号入力端（１）と信号出力端（２）
との間に直列に接続された抵抗及びコイル、Ｌ、、Ｃ１
は上記コイルＬ、、 Ｌ、の接続点と接地間に直列に接
続されたコイル及びコンデンサー、Ｌ、、Ｃ，は上記コ
イルＬ３． Ｌ、の接続点と接地間に直列に接続された
コイル及びコンデンサー、凡。はコイルＬ４の出力端＋
２）［ＩＩＱ端部と接地間に接続された抵抗である。上
記回路は、コイルし７、コンデンサーＣ８並びにコイル
し３、コンデンサーＣ１で直列共撮回路を構成し、コイ
ルＬ、、 Ｌ３． Ｌ、との協動で入力信号の所望の周
波数成分をカットするローパスフィルターとなっている
。(Description of FDNa!!!!! Filter) For example, when a fifth-order polar ladder type low-pass filter is constructed from a coil and a capacitor, it becomes as shown in FIG. In the figure, (1
) is the signal input terminal, (2) is the signal output terminal, Rg, L, .
L, , L are the signal input end (1) and the signal output end (2)
A resistor and a coil, L, , C1 connected in series between
are coils and capacitors connected in series between the connection point of the coils L, , L, and ground, and L, , C are the coils L3. A coil and a capacitor connected in series between the connection point of L and ground. is the output end of coil L4 +
2) [This is a resistor connected between the IIQ end and ground. In the above circuit, the coil 7, the capacitor C8, the coil 3 and the capacitor C1 constitute a series co-photographing circuit, and the coils L, , L3 . In cooperation with L, it becomes a low-pass filter that cuts desired frequency components of the input signal.
これをｌｉ’１）ＮＲ回回路用いて等価な回路を構成す
ると、第２図のようになる。第２図において、（８）は
入力端、（４）は出力端、Ｃｇ、ｉ（１，亀、鴫は入力
端（３）と出力端（４）との間に直列に接続され背ンデ
ンサー及び抵抗、Ｒ，、Ｄ、は上記抵抗Ｒ，、Ｒ３の接
続点と接地間に直列に接続された抵抗及び）’ＤＮｆｔ
回路、＆、Ｄｔは上記抵抗Ｒ３，Ｒ５の接続点と接地間
に伯列に接続された抵抗及びｌｌＤＮＩＬ回路、Ｃ・は
上記抵抗鳴の出力端（４）側端部と接地間に接続された
コンデンサーである。上記回路は、抵抗島、Ｌｉ”ＤＮ
Ｒ１路り、並びに抵抗比、 、Ｆ’ＤＮＲ回路り、で直
列共振回路を構成し、抵抗Ｒ，，Ｅｌ、５．Ｒ，との協
同とで、入力信号の所望の周波数成分をカットするロー
パスフィルターとなっている。When an equivalent circuit is constructed using this li'1)NR circuit, it becomes as shown in FIG. In Figure 2, (8) is the input terminal, (4) is the output terminal, Cg, i (1, Tortoise, and Shizu are the back capacitors connected in series between the input terminal (3) and the output terminal (4). and the resistors R, , D are the resistors connected in series between the connection point of the resistors R, , R3 and the ground, and )'DNft
The circuit &, Dt is a resistor connected in series between the connection point of the resistors R3 and R5 and the ground, and the IDNIL circuit is connected between the output terminal (4) side end of the resistor and the ground. It is a capacitor. The above circuit is a resistor island, Li”DN
A series resonant circuit is formed by the R1 circuit and the resistance ratio, , F'DNR circuit, and the resistors R, , El, 5. In cooperation with R, it becomes a low-pass filter that cuts desired frequency components of the input signal.
（従来技術とその問題点）
ところで、斯るｌ’ＤＮＲ型フィルタフイルター従来の
ｒｌ）Ｎ几回路は、第３図のようになっている。(Prior art and its problems) By the way, the conventional rl)N circuit of the l'DNR type filter is as shown in FIG.
第３図において、ｖｌは印加電圧で、ｃ、、 ａ６１几
７゜島ＩＣ４は信号入力側と接地間に直列に接続された
コンデンサー並びに抵抗（Ｃｓ 、Ｃ４はコンデンサー
、凡６〜鴫は抵抗） 、（５）、 （６）は第１及びｐ
４２の演算ＪｔＩ幅器でちる。そして、信号入力側とコ
ンデンサー〇、との間には第１のＭ痙増幅器（５）の正
入力端が凄続され、コンデンサーＣ１と抵抗Ｒ６の接続
点には第２の演′停増幅器（６）の出力端が接続され、
抵抗へ。In Figure 3, vl is the applied voltage, c,, a61 几7゜IC4 is a capacitor and a resistor connected in series between the signal input side and the ground (Cs and C4 are capacitors, and 6 to 6 are resistors) , (5), (6) are the first and p
42 operations JtI width unit. The positive input terminal of the first M-stop amplifier (5) is connected between the signal input side and the capacitor ○, and the second stop amplifier (5) is connected to the connection point between the capacitor C1 and the resistor R6. The output end of 6) is connected,
To resistance.
Ｒ７の接続点には第１、＠２の演算増幅器（５＞、 ＜
６）の負入力端がそれぞれ接続され、抵抗島、亀の接続
点には第１のＣ錘０−増幅器（５）の出力端が接続され
、抵抗Ｒ３とコンデンサー〇、の接続点には第２の演算
増幅器１６）の出力端が接続されている。参考までに示
すと、この回路におけるインピーダンスは上記インピー
ダンスは、第１図のコンデンサーＣＩ。At the connection point of R7, the first and @2 operational amplifiers (5>, <
6) are connected to each other, the output terminal of the first C weight 0-amplifier (5) is connected to the connection point between the resistor island and the turtle, and the connection point between the resistor R3 and the capacitor 〇 is connected to the The output terminal of the second operational amplifier 16) is connected. For reference, the impedance in this circuit is the impedance shown in Figure 1.
Ｃ２のインピーダンスに１／ｊω をかけて変換したも
のと癖しい。よってｌｉ’ｔ）ＮＲＩＯＩＩＩ！！のイ
ンピーダンスは、Ｃ＋＋Ｃ２のインピーダンスに１／ｊ
ωをかけたもの一１／（ＩＪ２Ｃ１ＴカＣ２，すなわち
ｍ−−−に比例しすω２
るインピーダンスになればよい。上記インピーダンスは
、−１Ｎに比例するインピーダンスになっており卜’Ｄ
ＮＲ１路として条件を満足する形となっている。This is similar to converting the impedance of C2 by multiplying it by 1/jω. Therefore, NRIOIII! ! The impedance of C++C2 is 1/j
ω multiplied by 1/(IJ2C1T−C2, that is, ω2).The above impedance is an impedance proportional to -1N, and
The shape satisfies the conditions for the NR1 road.
しかしながら、上記の構成においては、演算増幅器を、
２個用いているためコストが高くなり、またフィルター
の形状が大きくなるという欠点があった。However, in the above configuration, the operational amplifier is
Since two filters are used, the cost is high and the size of the filter is large.
（発明の目的）
本発明は上記従来欠点を解消するもので、演算増幅器の
数を減らした安価な回路構成のＰ ＤＮ Ｒ型フィルタ
ーを提供することを目的とする。(Object of the Invention) The present invention solves the above-mentioned conventional drawbacks, and aims to provide a PDN R-type filter with an inexpensive circuit configuration in which the number of operational amplifiers is reduced.
（発明の構成）
本発明は上記目的を達成するだめ、Ｌ／ＤＮＲ型フィル
タフイルター、信号入力側と演算増幅器の正、負入力端
との間におのおの抵抗を接続し、上記演擁°増Ｉ隔器の
出力端と負入力端との間に抵抗を接続すると共に、上記
演算増幅器の出力端と接地間には、抵抗、コンデンサー
を直列に接続し、核直列に接続された抵抗とコンデンサ
ーの接続点と上記演゛□□□１１１ｔｔｔＪ器の正入力
端との間にコンデンサーを接続して成る？’ＤＮＲ回路
を有することを特徴とする。(Structure of the Invention) In order to achieve the above object, the present invention connects a resistor between the L/DNR type filter, the signal input side and the positive and negative input terminals of the operational amplifier, and A resistor is connected between the output terminal of the separator and the negative input terminal, and a resistor and a capacitor are connected in series between the output terminal of the operational amplifier and the ground. A capacitor is connected between the connection point and the positive input terminal of the above-mentioned ゛□□□111tttJ device? 'It is characterized by having a DNR circuit.
（発明の実権例）
第４図は、本発明の実施例に係る演′Ｗ増鳴器を１個の
み用いたＦＤＮＲ，回路を示している。同図において、
ｖ２は印加電圧、（７）は演算増幅器で、信号入力側と
演算増幅器（７）の正、負入力端との間には抵抗Ｉ−並
びに抵抗ＦＬわがそれぞれ接続されている。(Example of the Practical Effect of the Invention) FIG. 4 shows an FDNR circuit using only one performance booster according to an embodiment of the present invention. In the same figure,
v2 is an applied voltage, (7) is an operational amplifier, and a resistor I- and a resistor FL are connected between the signal input side and the positive and negative input terminals of the operational amplifier (7), respectively.
また、演憾増幅器（７）の出力端と負入力端との間には
抵抗Ｒ１１が接続され、演算増幅器（７）の出力端と接
地間には抵抗島２、コンデンπ−Ｃ６が直列に接続され
、核コンデンサーＣ２と抵抗Ｒ１，の接続点と演算増幅
器（７）の正入力端との間にはコンデンサーＣ４が接続
された構成となっている。Furthermore, a resistor R11 is connected between the output terminal of the operational amplifier (7) and the negative input terminal, and a resistor island 2 and a capacitor π-C6 are connected in series between the output terminal of the operational amplifier (7) and the ground. A capacitor C4 is connected between the connection point between the core capacitor C2 and the resistor R1 and the positive input terminal of the operational amplifier (7).
上記回路構成において、そのインピーダンス”ＦＤＮＲ
は次式で表わされる。In the above circuit configuration, its impedance “FDNR
is expressed by the following equation.
（但しｒ崎算増幅器は理想的なものと考える。）ここで
、
ここに、上式右辺第１項は前記第３図ＺＦＤＮＲと同等
で、目、つ第２項の肌ａｔｅ／（へ＋Ｒ１゜）は一定値
であるので、 Ｆｌ）Ｎル回路として充分である。なお
。(However, it is assumed that the amplifier is ideal.) Here, the first term on the right side of the above equation is equivalent to ZFDNR in Figure 3 above, and the second term is ate/(to + R1 Since ゜) is a constant value, it is sufficient as a Fl)N circuit. In addition.
−上記右辺２Ａ２項は一定値で月つそのディメンシロ／
は抵抗のディメ／ジョ／であるので、第２同の１（２，
１４，をこの中に含めて考えることが出来る。即ち、あ
る条件（Ｃ５＋Ｃ１１）Δ）＝鳥ル、ｔ／１（＋。Ｒ１
，を満足していればこの卜’ＤＮＩ（回路は、１個の演
算増幅器（′７）で前成出来、かつ一定値の実抵抗が含
まれることとなる。- The term 2A2 on the right side above is a constant value, and the dimension of the month /
is the resistance dime/jo/, so the second same 1(2,
14, can be considered to be included in this. That is, a certain condition (C5+C11)Δ)=Toriru, t/1(+.R1
, this circuit can be formed with one operational amplifier ('7) and includes an actual resistance of a constant value.
（発明の効果う
以上のように本発明によれば、第２図におけるＬ”ＤＮ
ル１ｃ！１路り、、Ｄ２を第３図の回路から第４図の回
路に１［、′１′へ声えることにより、演■噛隅器が卜
１ｏｔｑａ回路１個当り１個減ることになる。また、本
発明のｌ’ＤＮｆ（回路では、上述したようにそのイン
ピーダンスにＲｏＲ＋。Ａ鳥＋−υなる抵抗分が出て来
るため、これを利用して、第２図のＦｌ）ＮＲ用型フィ
ルター中抵抗Ｒｔ−ｆＬ４をなくすことが出来る。よっ
て、従来の構成より総合的に凭ると、？” ｌ）Ｎ Ｒ
，回路中の演算増幅器が１個づつ減らせて、他の素子も
増えず、従って演１増幅器の減数分だけコストが下がり
、またフィルターの形状も小さく出来る。(Effects of the Invention) As described above, according to the present invention, L”DN in FIG.
Le 1c! 1, D2 from the circuit of FIG. 3 to the circuit of FIG. In addition, in the l'DNf circuit of the present invention, as mentioned above, a resistance component of RoR+.A+-υ appears in its impedance, so by utilizing this, The resistance Rt-fL4 in the filter can be eliminated. Therefore, what does it mean when compared to the conventional configuration? ” l) N R
, the number of operational amplifiers in the circuit can be reduced by one, and no other elements are added.Therefore, the cost can be reduced by the number of operational amplifiers reduced, and the shape of the filter can also be made smaller.
第１図は、一般的なＬＣフィルターを示す回路図、第２
図は第１図の等価回路たるＦＤＮＲ型フィルターの回路
図、第３図は従来のＦｌ）Ｎ几回路、第４図は本発明の
実施例に係るＦ’ＤＮＲ回路を示している。Figure 1 is a circuit diagram showing a general LC filter, Figure 2 is a circuit diagram showing a general LC filter.
The figure shows a circuit diagram of an FDNR type filter which is an equivalent circuit of FIG. 1, FIG. 3 shows a conventional Fl)N filter circuit, and FIG. 4 shows an F'DNR circuit according to an embodiment of the present invention.
Claims (1)
の抵抗を接続し、上記演算増幅器の出力端と負入力端と
の間に抵抗を接続すると共に、上記演算増幅器の出力端
と接地間には、抵抗、コンデンサーを直列に接続し、そ
の直列に接続された抵抗とコンデンサーの接続点と、上
記演算増幅器の正入力端との間にコンデンサーを接続し
て成るＦＤＮ几回路を有することを特徴とするＦＤＮＲ
型フィルターA resistor is connected between the signal input side and the positive and negative input terminals of the operational amplifier, and a resistor is connected between the output terminal and the negative input terminal of the operational amplifier, and the output terminal of the operational amplifier and the ground are connected. In between, there should be an FDN circuit consisting of a resistor and a capacitor connected in series, and a capacitor connected between the connection point of the series-connected resistor and capacitor and the positive input terminal of the operational amplifier. FDNR featuring
mold filter
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58239576A JPS60130911A (en) | 1983-12-19 | 1983-12-19 | Fdnr type filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58239576A JPS60130911A (en) | 1983-12-19 | 1983-12-19 | Fdnr type filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60130911A true JPS60130911A (en) | 1985-07-12 |
Family
ID=17046844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58239576A Pending JPS60130911A (en) | 1983-12-19 | 1983-12-19 | Fdnr type filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60130911A (en) |
-
1983
- 1983-12-19 JP JP58239576A patent/JPS60130911A/en active Pending
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