JPH09232700A - Printed wiring board - Google Patents
Printed wiring boardInfo
- Publication number
- JPH09232700A JPH09232700A JP4105196A JP4105196A JPH09232700A JP H09232700 A JPH09232700 A JP H09232700A JP 4105196 A JP4105196 A JP 4105196A JP 4105196 A JP4105196 A JP 4105196A JP H09232700 A JPH09232700 A JP H09232700A
- Authority
- JP
- Japan
- Prior art keywords
- point
- signal conductor
- branch
- branch point
- conductor
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
Landscapes
- Structure Of Printed Boards (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、プリント配線基板
に関し、特に高周波の信号導体の配線密度を向上させる
のに好適な高密度プリント配線基板に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board, and more particularly to a high density printed wiring board suitable for improving the wiring density of high frequency signal conductors.
【0002】[0002]
【従来の技術】従来例(公報番号特開平5−15276
8)に基づいて説明する。プリント基板は、導体幅と導
体厚の一定な信号導体を一定な厚さの絶縁層を介して四
角形の開口部が存在する導体厚が一定なグラウンド導体
で挟み、そのグラウンド導体の四角形の開口部の大きさ
で最適な特性インピーダンスを得ていた。2. Description of the Related Art A conventional example (JP-A-5-15276)
This will be described based on 8). A printed circuit board consists of a signal conductor with a constant conductor width and a constant conductor thickness sandwiched by a ground conductor with a constant conductor thickness with an insulating layer with a constant thickness, and a rectangular opening of the ground conductor. The optimum characteristic impedance was obtained with the size of.
【0003】[0003]
【発明が解決しようとする課題】第1の問題点は、開口
部が存在するグラウンド導体が絶縁層を介して挟み込む
形で設けた信号導体に於いて、分岐を有する信号導体
は、その信号導体の分岐後と、分岐前とでの信号導体線
幅が同じ幅で配線されていることで分岐前と分岐後との
特性インピーダンスの関係は、(分岐前の特性インピー
ダンスの値)=(分岐後の信号導体の合成特性インピー
ダンス)にならないために分岐本数によって特性インピ
ーダンスの値が異なり、反射が起きるとこと、及び特性
インピーダンスにおいて伝送路中変動が生じることで良
好な信号伝送を行うことができない欠点があった。A first problem is that, in a signal conductor provided with a ground conductor having an opening interposed therebetween with an insulating layer interposed therebetween, the signal conductor having a branch is a signal conductor having a branch. Because the signal conductor line width before and after the branch is the same, the relationship between the characteristic impedance before and after the branch is (value of the characteristic impedance before the branch) = (after the branch) The characteristic impedance value differs depending on the number of branches because the signal impedance does not become the sum of the signal conductors, and reflection occurs, and the characteristic impedance cannot be transmitted properly due to fluctuations in the characteristic impedance in the transmission path. was there.
【0004】第2の問題点は、電気回路的に分岐がない
信号導体の配線幅を途中で変えて配線密度を上げること
は、絶縁層の厚さ,信号導体厚,比誘電率が一定の場合
に、信号導体の線幅を途中で変化することは、特性イン
ピーダンスが変化し、それによる反射が発生し、良好な
信号伝送することができない欠点があった。[0004] The second problem is that increasing the wiring density by changing the wiring width of a signal conductor having no branch in an electric circuit in the middle of the wiring means that the thickness of the insulating layer, the thickness of the signal conductor, and the relative permittivity are constant. In this case, if the line width of the signal conductor changes in the middle, the characteristic impedance changes, which causes reflection, and there is a disadvantage that good signal transmission cannot be performed.
【0005】第3の問題点は、最適なインピーダンスを
得るため、信号導体を絶縁層を介して四角に開口したグ
ラウンド導体で挟み込むように設けるが、基板を動作さ
せる為のグラウンド導体とは別に必要で有るために開口
部の大きさにもよるが基板動作用としては電気的なグラ
ウンド導体の接続が弱くなるために回路の負荷ピーク時
に電源供給が不安定になる怖れがあり基板動作用のグラ
ウンド導体としては使用に耐え得られないものであるた
め、よって特性インピーダンスを得るためのみに別にグ
ラウンド導体を設けなければならない事態になり、層数
の増加に伴い、コストもその分跳ね上がるという欠点が
あった。A third problem is that, in order to obtain an optimum impedance, the signal conductor is provided so as to be sandwiched between ground conductors opened in a square via an insulating layer, but is required separately from the ground conductor for operating the substrate. However, depending on the size of the opening, the connection of the electrical ground conductor is weak for board operation, so there is a risk that power supply will be unstable at the peak load of the circuit. Since it cannot be used as a ground conductor, it is necessary to provide a separate ground conductor only to obtain characteristic impedance, and as the number of layers increases, the cost jumps accordingly. there were.
【0006】本発明は、この様な問題点を解決するため
に、分岐を有する信号導体の特性インピーダンスを信号
導体の分岐方法を変化させることで任意な特性インピー
ダンスを設定することを目的とする。In order to solve such a problem, it is an object of the present invention to set the characteristic impedance of a signal conductor having a branch by changing the branching method of the signal conductor.
【0007】[0007]
【課題を解決するための手段】本発明のプリント配線基
板は、2つの層に形成された基板動作用のグラウンド導
体と、基板動作用グラウンド導体に絶縁層を介して形成
された信号導体とを備え、その信号導体は、出力された
信号導体が、回路的に分岐を有する配線となっており、
且つその分岐点から接続先までの信号導体パターンの線
幅は、求める合成特性インピーダンス値によって設定を
変化させることにより、所要特性インピーダンスに合致
した値を得ることにより、伝送路中、信号反射のない良
好な伝送路特性インピーダンスを有することを特徴とす
るプリント配線基板が得られる。A printed wiring board according to the present invention includes a ground conductor for operating the substrate formed in two layers and a signal conductor formed on the ground conductor for operating the substrate via an insulating layer. Provided, the signal conductor, the output signal conductor is a wiring having a branch in the circuit,
In addition, the line width of the signal conductor pattern from the branch point to the connection destination is changed according to the desired combined characteristic impedance value to obtain a value that matches the required characteristic impedance, thereby preventing signal reflection in the transmission path. A printed wiring board characterized by having good transmission line characteristic impedance is obtained.
【0008】[0008]
【作用】信号導体と絶縁層を介してこれを挟む基板動作
用グラウンド導体とは、その特性インピーダンス(Z
0)は、図2に示すように、一般的に次の式が使用され
ている。The signal conductor and the board operation ground conductor sandwiching the signal conductor with an insulating layer interposed therebetween have the characteristic impedance (Z
0) generally uses the following equation, as shown in FIG.
【0009】 [0009]
【0010】また、上記式を信号導体幅(W)に変換す
ると、When the above equation is converted into a signal conductor width (W),
【0011】 [0011]
【0012】このことから、Wが小さくなればZ0が大
きくなり、Wが大きくなればZ0は小さくなる。また、
プリント配線基板の製造方法に於いて、部分的に銅箔厚
(T)を変化させることは、困難であることと、プリン
ト配線基板の比誘電率(εγ)は、一つの基板について
の一様な数値であり、また、層間厚(H)も同一層内で
は一定である特徴がある。From this, when W becomes small, Z0 becomes large, and when W becomes large, Z0 becomes small. Also,
In the method of manufacturing a printed wiring board, it is difficult to partially change the thickness (T) of the copper foil, and the relative dielectric constant (εγ) of the printed wiring board is uniform for one board. And the interlayer thickness (H) is constant within the same layer.
【0013】[0013]
【発明の実施の形態】次に本発明の実施の形態について
図面を参照して説明する。Embodiments of the present invention will now be described with reference to the drawings.
【0014】図1は本発明の第1の実施の形態のプリン
ト配線基板の平面図、図2は図1のA−A′線断面図で
ある。本発明の第1の実施の形態のプリント配線基板
は、図1および図2に示すように、基板動作用のグラウ
ンド導体3の上に、絶縁層2(H=0.3mm)を介し
て、電気回路的に形成される信号導体1の厚み(T=
0.04mm)に特性インピーダンスを50Ωに設定す
る場合に於いて、始点4から分岐点5と、分岐点5から
デバイスの接続点である端点6迄の各信号導体1の線長
が全て同じになるように分岐点5を選定する。分岐点5
の位置は始点4から端点6の間の任意の位置とする。か
つ、始点4から分岐点5迄の信号導体1の線幅が、0.
485mmと、分岐点5からそれぞれのデバイスを接続
する端点6迄の信号導体1の線幅が0.08mmに配設
する。信号導体1は直線でなく曲がりがあっても良い。
尚、上述の信号導体1の幅の設定以外や、分岐の本数が
n(n=整数)でも、それぞれの分岐点5から端点6ま
での信号導体1の線幅の設定値を選択することで特性イ
ンピーダンスを変えた同様な特性をもったプリント配線
基板を実現できることは言うまでもない。この場合、端
点6から分岐点5までの信号導体幅より、分岐点5から
端点6まで信号導体幅が原理的に細くなることが特徴で
ある。FIG. 1 is a plan view of a printed wiring board according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA 'of FIG. As shown in FIGS. 1 and 2, the printed wiring board according to the first embodiment of the present invention has a structure in which an insulating layer 2 (H = 0.3 mm) is interposed on a ground conductor 3 for board operation. The thickness of the signal conductor 1 (T =
When the characteristic impedance is set to 50Ω at 0.04 mm), the line lengths of the signal conductors 1 from the starting point 4 to the branch point 5 and from the branch point 5 to the end point 6 which is the connection point of the device are all the same. The branch point 5 is selected such that Branch point 5
Is an arbitrary position between the starting point 4 and the end point 6. Moreover, the line width of the signal conductor 1 from the start point 4 to the branch point 5 is 0.
485 mm, and the line width of the signal conductor 1 from the branch point 5 to the end point 6 connecting each device is set to 0.08 mm. The signal conductor 1 may have a curve instead of a straight line.
In addition to the above-described setting of the width of the signal conductor 1 and the setting of the line width of the signal conductor 1 from each branch point 5 to the end point 6 even when the number of branches is n (n = integer), It goes without saying that a printed wiring board having similar characteristics with a changed characteristic impedance can be realized. In this case, the characteristic is that the signal conductor width from the branch point 5 to the end point 6 is smaller in principle than the signal conductor width from the end point 6 to the branch point 5.
【0015】図3は本発明の第2の実施の形態の平面図
である。本発明の第2の実施の形態のプリント配線基板
は、図3に示すように、分岐後のダミーな信号導体1の
端点6に電子回路動作用ではない、分岐後の信号導体1
の導体幅設定による特性インピーダンスの値と同じ終端
抵抗8を配設したものである。尚信号導体1の分岐後の
導体の本数は複数であってもよい。FIG. 3 is a plan view of a second embodiment of the present invention. The printed wiring board according to the second embodiment of the present invention, as shown in FIG. 3, is provided at the end point 6 of the dummy signal conductor 1 after branching, not for operation of an electronic circuit.
The terminating resistor 8 having the same value as the characteristic impedance according to the conductor width setting is provided. The number of conductors after branching of the signal conductor 1 may be plural.
【0016】[0016]
【発明の効果】第1の効果は、電気回路的に複数の分岐
を有する信号導体で分岐後の信号導体の特性インピーダ
ンスの値に合った適切なデバイスが接続されている場合
に於いて、始点から分岐点までの信号導体に於ける特性
インピーダンスと、分岐点から適切なデバイスが接続さ
れている端点までの特性インピーダンスとの合成インピ
ーダンスが等価にすることで始点から端点までの特性イ
ンピーダンスがみなし上、一定になることで信号導体の
分岐があっても、分岐前の信号導体線幅に比べ、分岐後
の信号導体幅を細くすることができ、分岐前の配線密度
に比べ、分岐後の配線密度を向上させることができ、高
密度配線を容易に実現できる。The first effect is that a signal conductor having a plurality of branches in an electric circuit is connected to an appropriate device that matches the characteristic impedance of the branched signal conductor. The characteristic impedance from the start point to the end point is assumed by making the combined impedance of the characteristic impedance of the signal conductor from the branch point to the branch point and the characteristic impedance from the branch point to the end point to which the appropriate device is connected equal. Even if there is a branch of the signal conductor by making it constant, the width of the signal conductor after branching can be narrower than the signal conductor line width before branching, and the wiring density after branching can be smaller than the wiring density before branching. The density can be improved, and high-density wiring can be easily realized.
【0017】第2の効果は、この実施例2にある要領に
てそれぞれの配線を行い、配線した端点に特性インピー
ダンスと同じ値の終端抵抗設けることで、反射のない伝
送路を持ち、分岐後から基板動作用のデバイス迄の信号
導体の導体幅を細くすることができるので、配線密度を
向上できる。The second effect is that each wiring is performed in the same manner as in the second embodiment, and a terminating resistor having the same value as the characteristic impedance is provided at the wired end point, so that a transmission line without reflection is provided, and Since the width of the signal conductor from the substrate to the device for operating the substrate can be reduced, the wiring density can be improved.
【図1】本発明の第1の実施の形態のプリント配線基板
の平面図である。FIG. 1 is a plan view of a printed wiring board according to a first embodiment of the present invention.
【図2】図1のA−A′線断面図である。FIG. 2 is a sectional view taken along line AA ′ of FIG.
【図3】本発明の第2の実施の形態のプリント配線基板
の平面図である。FIG. 3 is a plan view of a printed wiring board according to a second embodiment of the present invention.
1 信号導体 2 絶縁層 3 グラウンド導体 4 始点(ランド・パッド) 5 分岐点 6 端点(ランド、パッド) 7 ランド、パッド 8 終端抵抗 W 信号導体線幅の寸法値 H 絶縁層の厚み寸法値 T 信号導体の厚み寸法値 εγ 絶縁層の基材の比誘電率 1 Signal Conductor 2 Insulating Layer 3 Ground Conductor 4 Starting Point (Land Pad) 5 Branching Point 6 End Point (Land, Pad) 7 Land, Pad 8 Termination Resistance W Dimension of Signal Conductor Width H Dimension of Insulating Layer Dimension T Signal Conductor thickness dimension εγ Relative permittivity of base material of insulating layer
Claims (2)
岐点までの一本の信号導体と、前記分岐点から端点まで
複数の前記信号導体を有し、前記始点から前記分岐点ま
での前記信号導体の線長と、前記分岐点から複数の前記
端点までの一本あたりの前記信号導体の線長を同じ長さ
で配線し、前記始点から前記分岐点までの前記信号導体
の配線幅の設定による特性インピーダンスと、前記分岐
点から前記端点までの各前記信号導体配線幅の設定によ
る特性インピーダンスの合成インピーダンスとが等価に
なるように構成されたことを特徴とするプリント配線基
板。An electric circuit has one signal conductor from a start point to a branch point, and a plurality of signal conductors from the branch point to an end point, and has a plurality of signal conductors from the start point to the branch point. Wire length of the signal conductor and wire length of the signal conductor per one from the branch point to the plurality of end points are wired with the same length, and the wiring width of the signal conductor from the start point to the branch point And a composite impedance of the characteristic impedance set by setting the width of each signal conductor from the branch point to the end point.
も一本導体配線幅の設定による特性インピーダンスと同
じ値の終端抵抗を端点に接続したことを特徴とする請求
項1記載のプリント配線基板。2. A printed wiring board according to claim 1, wherein a terminal resistor having the same value as the characteristic impedance by setting at least one conductor wiring width of the signal conductor from the branch point to the end point is connected to the end point. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8041051A JP2708034B2 (en) | 1996-02-28 | 1996-02-28 | Printed wiring board |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8041051A JP2708034B2 (en) | 1996-02-28 | 1996-02-28 | Printed wiring board |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09232700A true JPH09232700A (en) | 1997-09-05 |
JP2708034B2 JP2708034B2 (en) | 1998-02-04 |
Family
ID=12597614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8041051A Expired - Fee Related JP2708034B2 (en) | 1996-02-28 | 1996-02-28 | Printed wiring board |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2708034B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010267334A (en) * | 2009-05-15 | 2010-11-25 | Nhk Spring Co Ltd | Flexure for disk device |
-
1996
- 1996-02-28 JP JP8041051A patent/JP2708034B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010267334A (en) * | 2009-05-15 | 2010-11-25 | Nhk Spring Co Ltd | Flexure for disk device |
Also Published As
Publication number | Publication date |
---|---|
JP2708034B2 (en) | 1998-02-04 |
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