JPH088463B2 - Method for manufacturing low-pass filter device - Google Patents
Method for manufacturing low-pass filter deviceInfo
- Publication number
- JPH088463B2 JPH088463B2 JP63303341A JP30334188A JPH088463B2 JP H088463 B2 JPH088463 B2 JP H088463B2 JP 63303341 A JP63303341 A JP 63303341A JP 30334188 A JP30334188 A JP 30334188A JP H088463 B2 JPH088463 B2 JP H088463B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- fdnr
- filter
- resistance
- pass filter
- 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.)
- Expired - Lifetime
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Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はFDNR回路を用いたローパスフィルタ装置の製
造方法に関するものである。TECHNICAL FIELD The present invention relates to a method for manufacturing a low-pass filter device using an FDNR circuit.
（従来の技術） ｎ次のローパスフィルタ回路は主としてコンデンサ及
びコイル（リアクトル）の梯子回路で形成されるが、基
板に回路を実装する場合、コンデンサやコイルは抵抗の
ように基板に印刷形成できず電子部品として基板にハン
ダ付けして実装しなければならなく、その製造が煩雑と
なる。そこでフィルタ回路を形成する各インピーダンス
を複素変数（ｊω）で除算した構成素子に変換する所謂
LCシュミレーション法で、コイルを使用しない等価回路
を形成している。この等価回路において容量分のインピ
ーダンス（コンデンサ）はFDNR回路に置換えされるもの
で、FDNR回路を用いた連立チェビシェフ形フィルタは実
開昭56−104232号公報，同61−107224号公報等に開示さ
れている。(Prior Art) An nth-order low-pass filter circuit is mainly formed by a ladder circuit of a capacitor and a coil (reactor), but when the circuit is mounted on the substrate, the capacitor and the coil cannot be formed on the substrate by printing like a resistor. The electronic parts must be soldered and mounted on the board, and the manufacturing thereof becomes complicated. Therefore, the so-called conversion of each impedance forming the filter circuit into the constituent elements divided by the complex variable (jω)
The LC simulation method forms an equivalent circuit that does not use a coil. In this equivalent circuit, the impedance (capacitor) for the capacitance is replaced by the FDNR circuit, and simultaneous Chebyshev type filters using the FDNR circuit are disclosed in Japanese Utility Model Publication Nos. 56-104232 and 61-107224. ing.
前述の連立チェビシェフ形ローパスフィルタ回路は、
第１図に例示するように梯子状の多段とした各フィルタ
部（並列態様に接続されるFDNR回路Z1とこれとの直列抵
抗R1と、直列態様に接続される抵抗R2よりなる型フィ
ルタ）の周波数特性が重合した特性を持つもので、減衰
が鋭く減衰減での減衰が多くとれ、更にフィルタ部の数
と対応する伝達零点を有すると云う特徴を備えている。The simultaneous Chebyshev-type low-pass filter circuit described above is
As shown in FIG. 1, each of the ladder-shaped multi-stage filter units (type composed of an FDNR circuit Z 1 connected in parallel, a series resistance R 1 with the FDNR circuit Z 1, and a resistance R 2 connected in series) The frequency characteristic of the filter is a superposed characteristic, and it has a characteristic that the attenuation is sharp and a large amount of attenuation can be obtained, and further, there is a transmission zero point corresponding to the number of filter parts.
（発明が解決しようとする課題） 前記FDNR回路タイプのローパスフィルタ回路は現実に
回路基板に実装した場合、設計上の理論特性が発揮され
ない場合がある。これは回路素子たる抵抗，コンデンサ
等に微妙な誤差が存在するためである。そこでどの抵抗
を調整すれば周波数特性の適切な変化が得られるかどう
か実験したところ、前記した抵抗R1及び抵抗R2の抵抗値
を変化させても周波数特性はあまり変化せず、FDNR回路
の各素子の値を変化させると、周波数特性は大きく変化
することが認められた。また各フィルタ部が設計上の周
波数特性を発揮するには、伝達零点を設計上の計算値と
一致させれるようにFDNR回路の回路素子を調整すれば、
フィルタ回路全体の周波数特性が設計値と一致するもの
である。(Problems to be Solved by the Invention) When the FDNR circuit type low-pass filter circuit is actually mounted on a circuit board, theoretical design characteristics may not be exhibited. This is because there are subtle errors in the circuit elements such as resistors and capacitors. Therefore, an experiment was conducted to see which resistance should be adjusted to obtain an appropriate change in the frequency characteristics.The frequency characteristics did not change much even if the resistance values of the resistors R 1 and R 2 were changed, and the FDNR circuit It was confirmed that the frequency characteristics greatly changed when the value of each element was changed. In addition, in order for each filter section to exhibit the designed frequency characteristics, if the circuit elements of the FDNR circuit are adjusted so that the transmission zero is matched with the design calculated value,
The frequency characteristic of the entire filter circuit matches the design value.
しかし回路基板に各回路素子を組み込み、ｎ次フィル
タ回路を実装した後、FDNR回路の回路素子例えば抵抗部
分をレーザートリミング等で抵抗値の調整を行おうとし
ても、どのフィルタ部がどの伝達零点と対応するのか明
確でない場合もあり、誤ってトリミングする危険があ
る。例えば第６図（イ）はトリミング作業前のフィルタ
回路の周波数特性を示すグラフであるが、設計値では10
0KHz,110KHz,120KHzの伝達零点が存在すべきなのに、10
0KHz以下の伝達零点Pa,Pbが２個計測され、100KHz〜110
KHzの間に残りの伝達零点Pcが計測されると、伝達零点
が100KHzとなるよう調整すべきフィルタ部と対応する伝
達零点がPa,Pbのいずれであるか不明であり、更には110
KHz及び120KHzに調整すべきフィルタ部も特定できな
い。However, after each circuit element is mounted on the circuit board and the nth-order filter circuit is mounted, even if the circuit element of the FDNR circuit, for example, the resistance portion is adjusted by laser trimming or the like to adjust the resistance value, which filter portion is the transmission zero point. Sometimes it is not clear what to do and there is a risk of accidental trimming. For example, FIG. 6 (a) is a graph showing the frequency characteristics of the filter circuit before trimming work.
There should be 0KHz, 110KHz and 120KHz transmission zeros, but 10
Two transmission zeros P a and P b below 0 KHz are measured and 100 KHz to 110
When the remaining transmission zero Pc is measured during KHz, it is unknown whether the transmission zero corresponding to the filter unit to be adjusted so that the transmission zero becomes 100 KHz is P a or P b , and further. 110
The filter part to be adjusted to KHz and 120KHz cannot be specified.
（課題を解決するための手段） 本発明は前記課題を鑑み、周波数特性の調整を容易と
し、設計通りの特性を有するローパスフィルタを得る手
段を提案したものである。(Means for Solving the Problems) In view of the above problems, the present invention proposes a means for facilitating the adjustment of the frequency characteristics and obtaining a low-pass filter having the characteristics as designed.
本発明に係るローパスフィルタ装置は、回路基板上
に、複数のFDNR回路を有する連立チェビシェフ形フィル
タを形成するために、回路構成素子を組み込む際に、各
FDNR回路を構成する抵抗の抵抗値が設計値より小さくな
るように電気抵抗を印刷形成すると共に、各FDNR回路部
分を予め電気的に分離して設けておき、基板に組み込ん
だ後に各FDNR回路毎に周波数特性をチェックしながら当
該FDNR回路内の抵抗部分をトリミングして当該FDNR回路
部分の周波数特性を所望のものとし、しかる後にNDNR回
路部分の電気的分離部を接続してなることを特徴とする
ものである。The low-pass filter device according to the present invention, when forming a circuit component element in order to form a simultaneous Chebyshev type filter having a plurality of FDNR circuits on a circuit board,
The electrical resistance is printed and formed so that the resistance value of the resistors that make up the FDNR circuit is smaller than the design value, and each FDNR circuit part is provided in advance by being electrically separated, and after each FDNR circuit is mounted on the board, The frequency characteristic of the FDNR circuit portion is made desired by trimming the resistance portion in the FDNR circuit while checking the frequency characteristic, and thereafter the electrical separation portion of the NDNR circuit portion is connected. To do.
（作 用） 分離したFDNR回路（フィルタ部）の構成素子である抵
抗をトリミングすると、他の回路からの影響を受けずに
FDNR回路の周波数特性を個々に設計値に調整でき、調整
後同FDNR回路を接続するとフィルタ回路全体の周波数特
性も設計値通りの機能を発揮するものである。(Operation) Trimming the resistor, which is a constituent element of the separated FDNR circuit (filter section), makes it possible to avoid being affected by other circuits.
The frequency characteristics of the FDNR circuit can be individually adjusted to the designed values, and if the FDNR circuit is connected after adjustment, the frequency characteristics of the entire filter circuit will also function as designed.
（実施例） 次に本発明の実施例について説明する。(Example) Next, the Example of this invention is described.
本発明に係る製造方法が適用されるローパスフィルタ
回路は、第１図（イ）に示すようにLC直列回路を並列態
様に、Ｌを直列態様に多段梯子状に接続した周知のもの
を、LCシュミレーション法で、抵抗とFDNR回路に置換し
たものである。具体的には第１図（ロ）に示すように入
力と出力との間に直列態様抵抗R1,R3……と並列態様の
直列する抵抗R2,R4……とFDNR回路Z1,Z2,Z3の状回路
からなるフィルタ部A,B,C,Dを４段設けて所望の周波数
特性を得るようにしたもので、FDNR回路Z1,Z2,Z3の詳細
及び回路全体の詳細例は第２図に示す通りである。勿論
前記回路自体は新規ではなく周知のものである。本発明
は前記回路の回路基板への実装手段に特徴を有するもの
である。The low-pass filter circuit to which the manufacturing method according to the present invention is applied is a well-known low-pass filter circuit in which an LC series circuit is connected in parallel and L is connected in series in a multi-stage ladder shape as shown in FIG. This is a simulation method in which a resistor and an FDNR circuit are replaced. Specifically, as shown in FIG. 1 (b), the series mode resistors R 1 , R 3 ... and the parallel series resistors R 2 , R 4 ... and the FDNR circuit Z 1 are connected between the input and the output. , which was to obtain a filter section a comprising Jo circuit Z 2, Z 3, B, C, the desired frequency characteristics are provided four stages D, details and the FDNR circuits Z 1, Z 2, Z 3 A detailed example of the entire circuit is as shown in FIG. Of course, the circuit itself is not new and is well known. The present invention is characterized by means for mounting the circuit on a circuit board.
フィルタ回路を回路基板１に実装し、フィルタ装置を
形成するに際して、各構成素子（抵抗，コンデンサ,OP
アンプ等）を基板１に組み込むとき、FDNR回路Z1,Z2,Z3
を構成する抵抗r1,r2,r3を予め設計上求めた抵抗値より
小さくなるよう基板１に印刷形成する場合、設計値対応
面積よりも10％程度大きく印刷し（印刷面積を広くする
と電流の流れる幅が広くなり流れ易くなるので抵抗値が
小さくなる）、またフィルタ部A,B,Cの内並列態様のFDN
R回路直列抵抗R2,R4,R6の伝送回路側に電気的切断をな
す切断部イ，ロ，ハを設け、FDNR回路回路Z1,Z2,Z3を含
む構成部分を電気的に分離し、各独立した回路構成と
し、而かる後分離したフィルタ部Ａ′（R2とZ1の直列回
路）に適宜な入力信号を加えてフィルタ部Ａ′の伝達零
点を見出しながらレーザトリミングをし、前記伝達零点
が設計値で定めた共振周波数f01（100KHz）上に生ずる
ようにして、設計値通りの周波数特性を発揮する抵抗値
に調整するものである。周波数特性の伝達零点を求めな
がらのトリミングは、作業上煩雑であるので、共振周波
数での位相をチェックしながら伝達零点を定めても良
い。When the filter circuit is mounted on the circuit board 1 to form the filter device, each constituent element (resistor, capacitor, OP
FDNR circuit Z 1 , Z 2 , Z 3
When the resistors r 1 , r 2 and r 3 that compose the above are printed on the substrate 1 so as to be smaller than the resistance value obtained in advance by designing, print them by about 10% larger than the design value corresponding area Since the width of the current flow becomes wider and the flow becomes easier, the resistance value becomes smaller.)
R circuit series resistors R 2 , R 4 and R 6 are provided with disconnecting parts a, b and c on the transmission circuit side to electrically disconnect the components including the FDNR circuit circuits Z 1 , Z 2 and Z 3. Laser trimming while finding the transmission zero of the filter unit A'by adding an appropriate input signal to the separated filter unit A '(series circuit of R 2 and Z 1 ) after separation. Then, the transmission zero is generated on the resonance frequency f 01 (100 KHz) defined by the design value, and the resistance value is adjusted to exhibit the frequency characteristic according to the design value. Trimming while obtaining the transmission zero of the frequency characteristic is complicated in work, so the transmission zero may be set while checking the phase at the resonance frequency.
次にフィルタ部Ａ′の抵抗r1のトリミングが終了する
と、順次フィルタ部Ｂ′（R4とZ2の直列回路），フィル
タ部Ｃ′（R6とZ3の直列回路）の各トリミングを行い、
第５図に示すように各フィルタ部の周波数特性における
伝達零点が設計値（100KHz,110KHz,120KHz）となり、而
かる後切断部イ，ロ，ハをハンダ等で接続するとフィル
タ回路が構成され、その周波数特性は前記フィルタ
Ａ′,B′,C′の特性を重合した特性を得ることができる
ものである（第６図）。Next, when trimming of the resistor r 1 of the filter unit A ′ is completed, trimming of the filter unit B ′ (series circuit of R 4 and Z 2 ) and the filter unit C ′ (series circuit of R 6 and Z 3 ) are sequentially performed. Done,
As shown in Fig. 5, the transmission zero point in the frequency characteristics of each filter part becomes the design value (100KHz, 110KHz, 120KHz), and if the after-cutting parts a, b, and c are connected with solder, etc., the filter circuit is constructed. The frequency characteristic can be obtained by superposing the characteristics of the filters A ', B', C '(FIG. 6).
尚前記実施例において切断個所イ，ロ，ハは特に回路
中この位置に限定されず、FDNR回路Z1を含むものであれ
ば良く、第３図に例示したようにフィルタ部A,A′,A″
のいずれでも良い。また抵抗値を調整する抵抗もFDNR回
路内の抵抗であればどの抵抗素子を調整対象としても良
い。更には第１図の例示したようにフィルタ回路にFDNR
回路を有しないフィルタ部Ｄが組み込まれていても良
く、本発明はFDNR回路回路が一つでも含まれるフィルタ
部を有する連立チェビシェフ形フィルタであれば適用さ
れるものである。In the above embodiment, the cutting points a, b and c are not particularly limited to this position in the circuit and may be any as long as they include the FDNR circuit Z 1, and as shown in FIG. 3, the filter parts A, A ′, A ″
Any of Further, the resistance for adjusting the resistance value may be any resistance element as long as it is a resistance in the FDNR circuit. Further, as illustrated in FIG. 1, the FDNR is applied to the filter circuit.
A filter section D having no circuit may be incorporated, and the present invention is applicable to any simultaneous Chebyshev type filter having a filter section including at least one FDNR circuit circuit.
（発明の効果） 以上のように本発明は、連立チェビシェフ形フィルタ
に於て、FDNR回路内の抵抗値を予め設計値より小さく印
刷形成すると共に、FDNR回路部分（フィルタ部）を電気
的に分離し、分離したFDNR回路部分の周波数特性を計測
しつつ、トリミングをなし、前記抵抗値調整し、設計上
の特性と一致せしめた後、分離部を接続し、フィルタ装
置を形成するもので、誤調整が少なく且つ調整作業自体
も容易になるものである。(Effects of the Invention) As described above, in the simultaneous Chebyshev-type filter according to the present invention, the resistance value in the FDNR circuit is printed smaller than the designed value in advance, and the FDNR circuit portion (filter portion) is electrically separated. Then, while measuring the frequency characteristics of the separated FDNR circuit part, trimming is performed, the resistance value is adjusted, and after matching the designed characteristics, the separating part is connected to form the filter device. There is little adjustment and the adjustment work itself becomes easy.
第１図はフィルタ回路の簡便な回路図、第２図は同詳細
図、第３図はフィルタ部の構成例を示し、第４図は基板
実装状態を示し、第５図は各フィルタ部の調整前と調整
後の周波数特性のグラフであり、第６図（イ）（ロ）は
フィルタ回路全体の周波数特性を示すグラフで、（イ）
は調整前，（ロ）は調整後を示すものである。 １は回路基板 A,A′……B,Cフィルタ部 イ，ロ，ハは切断部 Pa,Pa,Pb……Pcは伝達零点 R1,R2……R6,r1,r2,r3は抵抗FIG. 1 is a simplified circuit diagram of a filter circuit, FIG. 2 is a detailed view of the same, FIG. 3 shows a configuration example of a filter section, FIG. 4 shows a board mounted state, and FIG. 5 shows each filter section. 6A and 6B are graphs of frequency characteristics before and after adjustment, and FIGS. 6A and 6B are graphs showing frequency characteristics of the entire filter circuit.
Shows before adjustment, and (b) shows after adjustment. 1 is a circuit board A, A '... B, C Filter section I, B, C is a cut section P a , P a , P b ...... P c is a transmission zero R 1 , R 2 ...... R 6 ,, r 1 , r 2 , r 3 is resistance
Claims (1)
立チェビシェフ形フィルタを形成するために、回路構成
素子を組み込む際に、各FDNR回路を構成する抵抗の抵抗
値が設計値より小さくなるように電気抵抗を印刷形成す
ると共に、各FDNR回路部分を予め電気的に分離して設け
ておき、基板に組み込んだ後に各FDNR回路毎に周波数特
性をチェックしながら当該FDNR回路内の抵抗部分をトリ
ミングして当該FDNR回路部分の周波数特性を所望のもの
とし、しかる後にNDNR回路部分の電気的分離部を接続し
てなることを特徴とするローパスフィルタ装置の製造方
法。1. A resistance value of a resistor constituting each FDNR circuit is smaller than a design value when a circuit component is incorporated in order to form a simultaneous Chebyshev type filter having a plurality of FDNR circuits on a circuit board. In addition to printing the electrical resistance as described above, each FDNR circuit part is electrically separated in advance, and after mounting it on the board, check the frequency characteristics of each FDNR circuit and check the resistance part in the FDNR circuit. A method for manufacturing a low-pass filter device, characterized by trimming to obtain a desired frequency characteristic of the FDNR circuit portion, and then connecting an electrical separating portion of the NDNR circuit portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63303341A JPH088463B2 (en) | 1988-11-30 | 1988-11-30 | Method for manufacturing low-pass filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63303341A JPH088463B2 (en) | 1988-11-30 | 1988-11-30 | Method for manufacturing low-pass filter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02149120A JPH02149120A (en) | 1990-06-07 |
| JPH088463B2 true JPH088463B2 (en) | 1996-01-29 |
Family
ID=17919806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63303341A Expired - Lifetime JPH088463B2 (en) | 1988-11-30 | 1988-11-30 | Method for manufacturing low-pass filter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH088463B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2909239A1 (en) * | 2006-11-27 | 2008-05-30 | Thomson Licensing Sas | ACTIVE PASS FILTER |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5379452A (en) * | 1976-12-24 | 1978-07-13 | Hitachi Denshi Ltd | Band pass filter |
-
1988
- 1988-11-30 JP JP63303341A patent/JPH088463B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02149120A (en) | 1990-06-07 |
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