US20010015288A1 - Microcircuit shielded, controlled impedance "gatling gun" via - Google Patents
Microcircuit shielded, controlled impedance "gatling gun" via Download PDFInfo
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- US20010015288A1 US20010015288A1 US09/182,287 US18228798A US2001015288A1 US 20010015288 A1 US20010015288 A1 US 20010015288A1 US 18228798 A US18228798 A US 18228798A US 2001015288 A1 US2001015288 A1 US 2001015288A1
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- 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
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0219—Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors
- H05K1/0222—Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors for shielding around a single via or around a group of vias, e.g. coaxial vias or vias surrounded by a grounded via fence
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
- H01L23/64—Impedance arrangements
- H01L23/66—High-frequency adaptations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/58—Structural electrical arrangements for semiconductor devices not otherwise provided for
- H01L2223/64—Impedance arrangements
- H01L2223/66—High-frequency adaptations
- H01L2223/6605—High-frequency electrical connections
- H01L2223/6616—Vertical connections, e.g. vias
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/58—Structural electrical arrangements for semiconductor devices not otherwise provided for
- H01L2223/64—Impedance arrangements
- H01L2223/66—High-frequency adaptations
- H01L2223/6605—High-frequency electrical connections
- H01L2223/6616—Vertical connections, e.g. vias
- H01L2223/6622—Coaxial feed-throughs in active or passive substrates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/05599—Material
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- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/45001—Core members of the connector
- H01L2224/4501—Shape
- H01L2224/45012—Cross-sectional shape
- H01L2224/45014—Ribbon connectors, e.g. rectangular cross-section
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- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
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- H01L2224/48091—Arched
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- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
- H01L2224/8538—Bonding interfaces outside the semiconductor or solid-state body
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- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L24/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
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- H01L2924/01078—Platinum [Pt]
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- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/14—Integrated circuits
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3011—Impedance
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3025—Electromagnetic shielding
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09618—Via fence, i.e. one-dimensional array of vias
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09809—Coaxial layout
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- 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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/04—Soldering or other types of metallurgic bonding
- H05K2203/049—Wire bonding
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- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
Definitions
- the present invention relates generally to microcircuits and more particularly to a “Gatling gun” via, that is a via having a center conductor via surrounded by ground vias.
- Today's complex integrated circuits typically employ of several million transistors on a single integrated circuit substrate. Multiple layers of conductive material are formed overlying the substrate in order for these millions of transistors to interconnect and work as a whole. To facilitate electrical communication between conductive layers, via structures are used. Vias are openings etched through dielectric layers between a first conductive layer and a second conductive layer.
- Circuit board interconnects generally fall into three categories.
- the first category employs a laminated epoxy-filled cloth. The individual layers have electronically conductive paths of patterned copper.
- the second category uses a base structure of epoxy filled-cloth. This base is then covered with multiple layers of photoimageable dielectric and patterned copper.
- the third category is composed of multiple layers of laminated ceramic, with individually patterned copper.
- the present invention is directed to the formation of “Gatling gun” vias with reference to the second category, although the concepts herein can apply to the other two interconnect schemes.
- Vias can be formed by drilling holes and then plating the paths through the holes.
- the via holes can extend through the complete multilayer board.
- the vias are electrically coupled to each copper (i.e., conductive) layer.
- vias can be formed using a conventional photoimage-generated via structure.
- the present invention provides a “Gatling gun” via to interconnect circuitry from a first side of a substrate or printed circuit board, to a second side of the substrate or board.
- the present via comprises a center conductor via surrounded by a plurality of ground vias.
- the plurality of ground vias shield the center conductor via, thus providing electrical isolation for the conductor via from the rest of the circuitry.
- One feature of the present invention is that the plurality of ground vias can be modified, adjusting their diameters and their placement relative to the center conductor via, in order to affect the overall characteristic impedance of the Gatling gun via. This feature is useful when propagating high frequency signals from the first side to the second side of the substrate.
- FIG. 1 shows a schematic cross-sectional view of a laminated epoxy core structure with a Gatling gun via according to the present invention.
- FIG. 2 shows a top view of the Gatling gun via.
- Gatling Following the outbreak of the American Civil War, Gatling became interested in firearms. In 1862 he patented the hand-crank, rapid fire Gatling gun.
- the first Gatling gun has six rifle barrels mounted around a central shaft. The barrels rotated around the shaft while the gun was operating. Each barrel was mechanically loaded once at the top of a rotation and fired once at the bottom of a rotation. The empty shell was ejected as the barrel advanced up towards a reload.
- Early models of the Gatling gun fired approximately 300 rounds per minute. By 1882, Gatling improved upon his design so that the gun fired 1200 rounds per minute.
- the design of the Gatling gun inspires the present invention.
- the model of a plurality of barrels around a central shaft is adopted in an improved via structure that provides better isolation and improved controlled impedance for electrically interconnecting circuitry from a first side of a substrate or printed circuit board, to circuitry on a second side of the substrate or board.
- the discussion below will disclose the present invention in a printed circuit board environment. But one skilled in the art will appreciate the present invention's applicability in a wide variety of applications, including single layer and multi-layer substrates and ceramic.
- FIG. 1 shows a schematic cross-sectional view of a laminated epoxy core structure with a Gatling gun via.
- a base or core laminate of multiple epoxy-filled cloth layers 110 has formed on its topside 112 a pattern of electrically conductive copper 120 while on its backside 114 , another pattern of electrically conductive copper 122 is formed.
- Patterns of copper are also formed on the laminate 110 which are electrically tied to ground as will be discussed more fully below.
- the patterns are generally disposed in x- and y-direction planes.
- the cross section also shows three drilled holes at 130 , 132 and 134 extending through the base laminate 110 as well as the copper patterns 120 , 122 , 124 and 126 .
- Holes 130 , 132 and 134 are generally disposed in a z-direction, interplanar to the patterns 120 , 122 , 124 and 126 .
- a dry film (not shown) can be vacuum laminated to the backside 114 in a conventional manner.
- the hole at 130 is then filled with conductive, plateable and solderable polymer (not shown) which can be applied as a paste or liquid in a conventional manner.
- the polymer is then cured and the dry film is stripped. This then forms the center conductor via at 130 .
- the holes at 132 and 134 are filled and cured.
- a wire bond 140 electrically connects the center conductor via 130 to the electrically conductive pattern 120 .
- the wire bond 140 could be a ribbon bond or dielectric tape or any material that will be able to propagate an electrical signal from the center conductor 130 , over the ground via 132 to the electrically conductive pattern 120 .
- FIG. 2 shows a top view of the Gatling gun via according to the present invention.
- the center conductor via 130 is surrounded by a plurality of ground vias 132 , 134 and 232 .
- a space 220 isolates the conductor via 130 from a ground plane 210 which electrically grounds the plurality of ground vias 132 , 134 and 236 .
- FIG. 2 illustrates the center conductor 130 being surrounded by eight ground vias. This number is not notably important. Isolation could be accomplished with as little as two vias. Increasing the number of ground vias, increases electrical isolation. Controlling the impedance of the structure is accomplished by varying the diameters of the conductor and ground vias, as well as their relative position from each other.
- One benefit of the present invention is that propagation of signals in a package employing the Gatling gun vias is enhanced while minimizing cross talk between signal conductors and power distribution noise. Use of the Gatling gun via also permits the circuit designer to tighten the space between two circuit regions, for example.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
Abstract
Description
- The present invention relates generally to microcircuits and more particularly to a “Gatling gun” via, that is a via having a center conductor via surrounded by ground vias.
- Today's complex integrated circuits typically employ of several million transistors on a single integrated circuit substrate. Multiple layers of conductive material are formed overlying the substrate in order for these millions of transistors to interconnect and work as a whole. To facilitate electrical communication between conductive layers, via structures are used. Vias are openings etched through dielectric layers between a first conductive layer and a second conductive layer.
- Circuit board interconnects generally fall into three categories. The first category employs a laminated epoxy-filled cloth. The individual layers have electronically conductive paths of patterned copper. The second category uses a base structure of epoxy filled-cloth. This base is then covered with multiple layers of photoimageable dielectric and patterned copper. The third category is composed of multiple layers of laminated ceramic, with individually patterned copper. The present invention is directed to the formation of “Gatling gun” vias with reference to the second category, although the concepts herein can apply to the other two interconnect schemes.
- Vias can be formed by drilling holes and then plating the paths through the holes. The via holes can extend through the complete multilayer board. In this configuration, the vias are electrically coupled to each copper (i.e., conductive) layer. Alternatively, vias can be formed using a conventional photoimage-generated via structure.
- One problem with via structures employed in high frequency applications is the lack of AC electrical isolation between the via and the remainder of the microcircuit. Another problem is that standard vias (formed either by drilling or by photoimaging) do not provide a controlled impedance environment at high frequencies.
- The present invention provides a “Gatling gun” via to interconnect circuitry from a first side of a substrate or printed circuit board, to a second side of the substrate or board. The present via comprises a center conductor via surrounded by a plurality of ground vias. The plurality of ground vias shield the center conductor via, thus providing electrical isolation for the conductor via from the rest of the circuitry. One feature of the present invention is that the plurality of ground vias can be modified, adjusting their diameters and their placement relative to the center conductor via, in order to affect the overall characteristic impedance of the Gatling gun via. This feature is useful when propagating high frequency signals from the first side to the second side of the substrate.
- FIG. 1 shows a schematic cross-sectional view of a laminated epoxy core structure with a Gatling gun via according to the present invention.
- FIG. 2 shows a top view of the Gatling gun via.
- Richard J. Gatling was born in 1818 in North Carolina, U.S.A. In his early 20s, Gatling invented and improved upon many agricultural implements, including a machine for sowing cotton and a steam-driven plow. But Gatling is probably best remembered for inventing a rapid-firing gun that bears his name.
- Following the outbreak of the American Civil War, Gatling became interested in firearms. In 1862 he patented the hand-crank, rapid fire Gatling gun. The first Gatling gun has six rifle barrels mounted around a central shaft. The barrels rotated around the shaft while the gun was operating. Each barrel was mechanically loaded once at the top of a rotation and fired once at the bottom of a rotation. The empty shell was ejected as the barrel advanced up towards a reload. Early models of the Gatling gun fired approximately 300 rounds per minute. By 1882, Gatling improved upon his design so that the gun fired 1200 rounds per minute.
- The design of the Gatling gun inspires the present invention. The model of a plurality of barrels around a central shaft is adopted in an improved via structure that provides better isolation and improved controlled impedance for electrically interconnecting circuitry from a first side of a substrate or printed circuit board, to circuitry on a second side of the substrate or board. The discussion below will disclose the present invention in a printed circuit board environment. But one skilled in the art will appreciate the present invention's applicability in a wide variety of applications, including single layer and multi-layer substrates and ceramic.
- FIG. 1 shows a schematic cross-sectional view of a laminated epoxy core structure with a Gatling gun via. A base or core laminate of multiple epoxy-filled cloth layers110 has formed on its topside 112 a pattern of electrically
conductive copper 120 while on its backside 114, another pattern of electricallyconductive copper 122 is formed. Patterns of copper (items 124 and 126) are also formed on the laminate 110 which are electrically tied to ground as will be discussed more fully below. The patterns (items - The cross section also shows three drilled holes at130, 132 and 134 extending through the base laminate 110 as well as the
copper patterns Holes patterns - Once the holes are drilled, a dry film (not shown) can be vacuum laminated to the backside114 in a conventional manner. The hole at 130 is then filled with conductive, plateable and solderable polymer (not shown) which can be applied as a paste or liquid in a conventional manner. The polymer is then cured and the dry film is stripped. This then forms the center conductor via at 130. In a similar manner, the holes at 132 and 134 are filled and cured.
- A
wire bond 140 electrically connects the center conductor via 130 to the electricallyconductive pattern 120. In another preferred embodiment, thewire bond 140 could be a ribbon bond or dielectric tape or any material that will be able to propagate an electrical signal from thecenter conductor 130, over the ground via 132 to the electricallyconductive pattern 120. - FIG. 2 shows a top view of the Gatling gun via according to the present invention. The center conductor via130 is surrounded by a plurality of
ground vias ground plane 210 which electrically grounds the plurality ofground vias - FIG. 2 illustrates the
center conductor 130 being surrounded by eight ground vias. This number is not terribly important. Isolation could be accomplished with as little as two vias. Increasing the number of ground vias, increases electrical isolation. Controlling the impedance of the structure is accomplished by varying the diameters of the conductor and ground vias, as well as their relative position from each other. One benefit of the present invention is that propagation of signals in a package employing the Gatling gun vias is enhanced while minimizing cross talk between signal conductors and power distribution noise. Use of the Gatling gun via also permits the circuit designer to tighten the space between two circuit regions, for example.
Claims (3)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/182,287 US6388206B2 (en) | 1998-10-29 | 1998-10-29 | Microcircuit shielded, controlled impedance “Gatling gun”via |
JP11285296A JP2000138433A (en) | 1998-10-29 | 1999-10-06 | Interconnection structure |
DE19949378A DE19949378A1 (en) | 1998-10-29 | 1999-10-13 | Shielded impedance-controlled Gatling gun vias |
GB9925204A GB2343298B (en) | 1998-10-29 | 1999-10-25 | Microcircuit shielded controlled impedance gatling gun via |
FR9913439A FR2785454B1 (en) | 1998-10-29 | 1999-10-27 | ARMORED METALLIZED ORIFICE WITH REGULATED IMPEDANCE OF THE GATLING GUN TYPE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/182,287 US6388206B2 (en) | 1998-10-29 | 1998-10-29 | Microcircuit shielded, controlled impedance “Gatling gun”via |
Publications (2)
Publication Number | Publication Date |
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US20010015288A1 true US20010015288A1 (en) | 2001-08-23 |
US6388206B2 US6388206B2 (en) | 2002-05-14 |
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Application Number | Title | Priority Date | Filing Date |
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US09/182,287 Expired - Fee Related US6388206B2 (en) | 1998-10-29 | 1998-10-29 | Microcircuit shielded, controlled impedance “Gatling gun”via |
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Country | Link |
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US (1) | US6388206B2 (en) |
JP (1) | JP2000138433A (en) |
DE (1) | DE19949378A1 (en) |
FR (1) | FR2785454B1 (en) |
GB (1) | GB2343298B (en) |
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US20020153977A1 (en) * | 2001-04-16 | 2002-10-24 | Mcdonough Robert J. | Apparatus and method for angled coaxial to planar structure broadband transition |
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US20060158280A1 (en) * | 2005-01-14 | 2006-07-20 | Uei-Ming Jow | High frequency and wide band impedance matching via |
US8957325B2 (en) | 2013-01-15 | 2015-02-17 | Fujitsu Limited | Optimized via cutouts with ground references |
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US11758656B2 (en) | 2018-06-11 | 2023-09-12 | Amphenol Corporation | Backplane footprint for high speed, high density electrical connectors |
US11765813B2 (en) | 2016-03-08 | 2023-09-19 | Amphenol Corporation | Backplane footprint for high speed, high density electrical connectors |
US11950356B2 (en) | 2014-11-21 | 2024-04-02 | Amphenol Corporation | Mating backplane for high speed, high density electrical connector |
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JP3820955B2 (en) * | 2001-10-12 | 2006-09-13 | 日本電気株式会社 | Build-up substrate and manufacturing method thereof |
US6828513B2 (en) * | 2002-04-30 | 2004-12-07 | Texas Instruments Incorporated | Electrical connector pad assembly for printed circuit board |
US7256991B2 (en) | 2002-10-22 | 2007-08-14 | Sullivan Jason A | Non-peripherals processing control module having improved heat dissipating properties |
BR0315624A (en) | 2002-10-22 | 2005-08-23 | Jason A Sullivan | Rugged Customizable Computer Processing System |
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- 1999-10-13 DE DE19949378A patent/DE19949378A1/en not_active Withdrawn
- 1999-10-25 GB GB9925204A patent/GB2343298B/en not_active Expired - Fee Related
- 1999-10-27 FR FR9913439A patent/FR2785454B1/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
FR2785454A1 (en) | 2000-05-05 |
DE19949378A1 (en) | 2000-05-11 |
GB9925204D0 (en) | 1999-12-22 |
FR2785454B1 (en) | 2002-10-11 |
US6388206B2 (en) | 2002-05-14 |
GB2343298A (en) | 2000-05-03 |
JP2000138433A (en) | 2000-05-16 |
GB2343298B (en) | 2003-03-12 |
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