WO2006121486A2 - High capacity thin module system and method - Google Patents
High capacity thin module system and method Download PDFInfo
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- WO2006121486A2 WO2006121486A2 PCT/US2006/006921 US2006006921W WO2006121486A2 WO 2006121486 A2 WO2006121486 A2 WO 2006121486A2 US 2006006921 W US2006006921 W US 2006006921W WO 2006121486 A2 WO2006121486 A2 WO 2006121486A2
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- WIPO (PCT)
- Prior art keywords
- circuit
- circuit module
- thermal
- substrate
- flex
- Prior art date
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Classifications
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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
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of a flexible or folded printed circuit
-
- 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
- H05K1/14—Structural association of two or more printed circuits
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
-
- 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
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
-
- 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
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
-
- 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
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
-
- 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
- H05K2201/05—Flexible printed circuits [FPCs]
- H05K2201/056—Folded around rigid support or component
-
- 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
- H05K2201/09372—Pads and lands
- H05K2201/09445—Pads for connections not located at the edge of the PCB, e.g. for flexible circuits
-
- 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
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10159—Memory
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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
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10431—Details of mounted components
- H05K2201/1056—Metal over component, i.e. metal plate over component mounted on or embedded in PCB
-
- 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
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10734—Ball grid array [BGA]; Bump grid array
-
- 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
- H05K2203/15—Position of the PCB during processing
- H05K2203/1572—Processing both sides of a PCB by the same process; Providing a similar arrangement of components on both sides; Making interlayer connections from two sides
-
- 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
- H05K3/0058—Laminating printed circuit boards onto other substrates, e.g. metallic substrates
- H05K3/0061—Laminating printed circuit boards onto other substrates, e.g. metallic substrates onto a metallic substrate, e.g. a heat sink
Definitions
- the present invention relates to systems and methods for creating high density circuit modules and, in particular, to systems and methods for creating such modules with features directed to reducing concentration of thermal loading.
- DIMM Dual In-line Memory Module
- PCB printed circuit board
- the DIMM is typically mounted in the host computer system by inserting a contact-bearing edge of the DIMM into a card edge connector.
- systems that employ DIMMs provide limited profile space for such devices and conventional DIMM-based solutions have typically provided only a moderate amount of memory expansion.
- the FB-DIMM circuit solution is expected to offer practical motherboard memory capacities of up to about 192 gigabytes with six channels and eight DIMMs per channel and two ranks per DIMM using one gigabyte DRAMs. This solution should also be adaptable to next generation technologies and should exhibit significant downward compatibility.
- MDP Multiple die packages
- Stacked packages are yet another way to increase module capacity. Capacity is increased by stacking packaged integrated circuits to create a high-density circuit module for mounting on the larger circuit board. In some techniques, flexible conductors are used to selectively interconnect packaged integrated circuits. Staktek Group L.P. has developed numerous systems for aggregating CSP (chipscale packaged) devices in space saving topologies. The increased component height of some stacking techniques may, however, alter system requirements such as, for example, required cooling airflow or the minimum spacing around a circuit board on its host system.
- the known methods for improved memory module performance or enlarged capacity raise thermal management issues.
- the primary thermal path is through the balls of the package into the core of a multilayer DIMM that has less than desirable thermal characteristics.
- AMB advanced memory buffer
- FB-DIMM FB-DIMM
- a significant amount of heat is generated. Consequently, the already marginal thermal shedding attributes of DIMM circuit modules is exacerbated in a typical FB-DIMM by the localized generation of heat by the AMB.
- a flexible circuitry is populated with integrated circuitry (ICs) disposed along one or both of its major sides. Contacts are distributed along the flexible circuitry to provide connection between the module and an application environment.
- the populated flexible circuitry is disposed about an edge of a rigid substrate thus placing the integrated circuitry on one or both sides of the substrate with one or two layers of integrated circuitry on one or both sides of the substrate.
- the substrate form is preferably devised from thermally conductive materials and includes a high thermal conductivity thermal sink or area that is disposed proximal to higher thermal energy IC devices when the flex circuit is brought about the substrate. This allows thermal conductivity between the hot IC and the thermal sink.
- the invention is particularly useful to disperse the thermal energy from hot circuitry such as, for example, AMBs employed with FB-DIMM circuitry mounted on the flexible circuitry.
- Other module variations may include thermally-conductive clips that thermally contact respective ICs on opposite sides of the module to further shunt heat from the ICs.
- no thermal sink is employed and the high heat device(s) mounted on the inner side of the flex circuitry is disposed in thermal contact with the substrate that is made from thermally conductive material.
- extensions from the substrate body or substrate core encourage reduced thermal variations amongst the ICs of the module while providing an enlarged surface for radiation of thermal energy from the module.
- Fig. 1 depicts a module devised in accordance with a preferred embodiment of the present invention. Certain cutaway areas expose internal construction details.
- Fig. 2 is a plan view of a module devised in accordance with a preferred embodiment of the present invention.
- FIG. 3 is an enlarged depiction of the area marked "A" in Fig. 1.
- FIG. 4 A illustrates a substrate employed in an alternative preferred embodiment of the present invention where a thermal sink is integral with the substrate.
- Fig. 4B illustrates a substrate employed with another alternative embodiment of the present invention in which an area of the substrate is deformed to provide an indentation.
- Fig. 5 is a cross-sectional view of a module devised in accordance with a preferred embodiment of the present invention.
- Fig. 6 depicts one side of a flex circuit employed in a preferred embodiment of the present invention.
- Fig. 7 depicts another side of the flex circuit depicted in Fig. 6.
- Fig. 8 depicts an exemplar end of a module devised in accordance with a preferred embodiment of the present invention.
- Fig. 9 is a cross-sectional view taken along a line through CSPs in a preferred embodiment of the present invention.
- Fig. 10 is a plan view of a module devised in accordance with an alternative embodiment of the present invention.
- Fig. 11 is a cross-sectional view of the module depicted in Fig. 10.
- Fig. 12 is a cross-sectional view of a flex circuit employed in a preferred embodiment of the present invention.
- Fig. 1 depicts a module 10 devised in accordance with a preferred embodiment of the present invention.
- the depiction of Fig. 1 illustrates module 10 having substrate 14 about which is disposed flex circuit 12 populated with ICs 18 which are, in a preferred embodiment, memory devices in CSP packages.
- Flex circuit 12 is cutaway in area "A" to illustrate internal preferred features of module 10. Area “A” is shown in greater enlargement in later Fig. 3.
- thermal sink 14TS and beyond the cutaway section of thermal sink 14TS there is shown a part of a circuit 19 which, in a preferred embodiment, is the well- known advanced memory buffer or AMB employed in FB-DIMM circuitry.
- AMB circuit 19 includes AMB die 19D and contacts 19C.
- a module in accordance with a preferred embodiment typically will exhibit plural CSPs of a first type, such as memory CSPs, for example, and will have at least one CSP of a second type, such as a microprocessor, graphics processor or buffer or, more particularly, an AMB, for example.
- Thermal sink 14TS is comprised, in this preferred embodiment, from metallic material of high thermal conductivity such as, for example, copper or copper alloy and has, in this preferred embodiment, a central portion 14TC that is a copper field substantially larger than and preferably in thermal contact with AMB die 19D either directly or through thermally- conductive adhesive or a thermally-conductive gasket material, for example. Thermal contact with a part of circuit 19 should be considered thermal contact with circuit 19.
- central portion 14TC of thermal sink 14TS is raised above the periphery of thermal sink 14TS and additionally provides on its other side, an indentation into which may be introduced at least a portion of AMB circuit 19 such as, for example, AMB die 19D, to assist in realization of a low profile for module 10.
- AMB circuit 19 such as, for example, AMB die 19D
- thermal sink 14TS is disposed over a window 250 through substrate 14.
- AMB circuit 19, which is mounted on the "inside" of flex circuit 12, is disposed, at least in part, into window 250 from the "back" side of substrate 14 to realize thermal contact with thermal sink 14TS to provide a conduit to reduce thermal energy loading of AMB circuit 19.
- Thermal sink 14TS need not cover the entirety of window 250. In other embodiments, for example, thermal sink 14TS may merely be across the window 250 or thermal sink 14TS may be set into window 250 instead of over or across the opening of window 250. Thermal sink 14TS is typically a separate piece of metal from substrate 14 but, after appreciating this specification, those of skill will recognize that, in alternative instances, thermal sink 14TS may be integral with substrate 14 or a particular portion of substrate 14 may be constructed to be a thermal sink 14TS in accordance with the teachings herein. For example, substrate 14 may be comprised of aluminum, while a thermal sink area 14TS of substrate 14 may be comprised of copper yet substrate 14 and thermal sink 14TS are of a single piece.
- thermal sink 14TS should be considered to be an area or element integral with or attached to a substrate 14 and the material from which that thermal sink is composed exhibits greater thermal conductivity than the material of the substrate.
- substrate 14 may be aluminum while thermal sink 14TS is comprised of copper.
- thermal sink 14Ts as opposed to the substrate in general which result in the different thermal conductivity characteristics between substrate 14 and thermal sink 14TS are represented by the different hatching of the Fig. 4 A.
- thermal sink 14TS in this depiction may be copper, for example, while the main body of substrate 14 may be comprised of aluminum, to name just one example.
- Another example could be a plastic bodied substrate 14 and a copper based thermal sink 14TS.
- Flex support 14FS is also shown in Fig. 4 A and is typically comprised of the same material as the bulk of substrate 14.
- FIG. 4B illustrates a substrate employed with another alternative embodiment of the present invention in which an area of the substrate is deformed to provide an indentation but no thermal sink 14TS is employed.
- substrates such as that depicted in Fig. 4B will not have a thermal sink but will rely on thermal contact between substrate 14 and circuit 19 to dissipate heat generated by circuit 19 where circuit 19 has been mounted on inner side 9 of flex circuit 12 as shown in later Fig. 7.
- indentation 14IN is not required.
- an exemplar embodiment that employed a substrate such as that shown in Fig. 4B and does not exhibit a thermal sink 14TS would look very much like the embodiment shown in Fig. 5 except that the structure labeled 14TS would not be separate from substrate 14 and would be a part of substrate 14 and composed from the same material. Further, no window 250 would be present since no opening in substrate 14 would be needed. Circuit 19 would be in thermal contact with substrate 14 rather than thermal sink 14TS. [0033] Where a window 250 in substrate 250 is employed, at least a part of thermal sink 14TS should be accessible through window 250 from the "other" side of substrate 14.
- AMB circuit 19 or other high heat circuit 19 and, in particular, AMB die 19D may be disposed in or across or over window 250 and preferably, will be introduced into an indentation of thermal sink 14TS and disposed in thermal contact with thermal sink 14TS and, more preferably, with the central core 14TC of thermal sink 14TS (where a central core has been optionally included in thermal sink 14TS) either with direct contact or through thermal adhesives or glues.
- Other embodiments may include additional windows where other high heat circuits are employed on module 10.
- Still other embodiments may insert some or all of ICs 18 into cutout areas in substrate 14 as described in detail in U.S. Pat. App. No. 11/005,992 which has been incorporated by reference herein.
- thermal sink 14TS covers window 250 (as will be further illustrated in later Fig 5) on one side of substrate 14 while AMB circuit 19 is disposed, at least in part, into window 250 to realize contact between thermal sink 14TS and AMB circuit 19 and particularly AMB die 19D either directly or as mediated through a thermally-conductive adhesive or glue.
- Fig. 2 depicts module 10 with the aspect it would externally present without the cutaways of area "A" as exhibited in Fig. 1. As shown, module 10 will present an array of CSPs 18 along its exterior. Closer inspection of an actual preferred module 10 would reveal that CSPs that were .
- FIG. 3 is an enlarged depiction of module 10 about the area marked "A" in Fig. 1.
- AMB circuit 19 is shown through window 250 through substrate 14.
- AMB circuit 19 is mounted on what will become the internal side 9 of flex circuit 12 relative to module 10 and is, therefore, inserted into window 250 from the "rear" relative to the perspective shown in Fig. 3.
- a portion of flex circuit 12 has been removed to expose thermal sink 14TS.
- Fig. 4 depicts, in a cross-sectional view, an exemplar alternative substrate 14 that includes thermal sink 14TS having a central area 14TC as an integral part of substrate 14.
- central area 14TC of thermal sink 14TS is configured to exhibit an indentation area 14IN to provide space for a higher profile device such as, for example, a higher profile device such as AMB circuit 19.
- Indentation 14IN is a preferred, but not required, feature in both those embodiments where thermal sink 14TS is integral with substrate 14 as well as those embodiments where thermal sink 14TS is accessible through a window in substrate 14.
- AMB circuit 19 such as, for example, AMB die 19D will preferably be introduced into indentation 14IN when module 10 is assembled.
- Substrate 14 further exhibits optional extension 16T that provides thermal advantages for a preferred module 10.
- An extension 16T is preferred whether or not thermal sink 14TS is integral with substrate 14 or is made accessible through window 250 of substrate 14.
- Extension 16T may be devised in a variety of configurations and need not extend laterally from the main axis of substrate 14 in both directions. For example, extension 16T may extend from substrate 14 in only one direction and need not be directly perpendicular from the main body of substrate 14.
- substrate 14 is comprised of thermally conductive material.
- a metallic material with aluminum being readily manipulated for configuration as substrate 14 is a preferred choice.
- Materials such as FR4 may be employed, but other non-metallic materials that are thermally conductive are preferred over FR4.
- Carbon-based materials and certain plastics, for example, are known to readily conduct thermal energy and, as alternatives to metallic materials, such materials may be employed to advantage in preferred embodiments in accordance with the present invention where metallic materials are not available or wanted.
- Flex support 14FS is shown located near end 16A of substrate 14. Flex support 14FS provides physical support for flex circuit 12 when flex circuit 12 is disposed about end 16 A. Flex support 14FS may be integral with or a separate piece from substrate 14.
- Fig. 5 is a cross-sectional view of an exemplar module 10 taken along perspective line B-B of Fig. 2.
- Fig. 5 shows a substrate 14 with a window 250 through which thermal sink 14TS is accessible.
- Substrate 14 has first and second lateral sides identified as Si and S 2 .
- Flex 12 is wrapped about perimeter edge 16A of substrate 14.
- AMB circuit 19 is mounted on inner side 9 of flex circuit 12.
- AMB circuit 19 is introduced, at least in part, into window 250 with AMB die 19D extending further into said window 250 to realize thermal contact with thermal sink 14TS of substrate 14.
- Fig. 6 depicts a first side 8 of flex circuit 12 ("flex", “flex circuitry”, “flexible circuit”) used in constructing a module according to an embodiment of the present invention.
- Flex circuit 12 is preferably made from one or more conductive layers supported by one or more flexible substrate layers as further described with reference to later Fig 12. The construction of flex circuitry is known in the art.
- ICs 18 on flexible circuit 12 are, in this embodiment, chip-scale packaged memory devices of small scale.
- chip-scale or "CSP" shall refer to integrated circuitry of any function with an array package providing connection to one or more die through contacts (often embodied as "bumps” or "balls” for example) distributed across a major surface of the package or die.
- CSP does not refer to leaded devices that provide connection to an integrated circuit within the package through leads emergent from at least one side of the periphery of the package such as, for example, a TSOP.
- Embodiments of the present invention may be employed with leaded or CSP devices or other devices in both packaged and unpackaged forms but where the term CSP is used, the above definition for CSP should be adopted. Consequently, although CSP excludes leaded devices, references to CSP are to be broadly construed to include the large variety of array devices (and not to be limited to memory only) and whether die-sized or other size such as BGA and micro BGA as well as flip-chip. As those of skill will understand after appreciating this disclosure, some embodiments of the present invention may be devised to employ stacks of ICs each disposed where an IC 18 is indicated in the exemplar Figs.
- circuit die may be included in a package depicted as a single IC 18. While in this embodiment memory ICs are used to provide a memory expansion board or module, and various embodiments may include a variety of integrated circuits and other components. Such variety may include microprocessors, FPGA' s, RF transceiver circuitry, digital logic, as a list of non-limiting examples, or other circuits or systems which may benefit from a high-density circuit board or module capability. In some preferred embodiments, circuit 19 will be an AMB, but the principles of the invention may be employed with a variety of heat generating devices such as, for example, a microprocessor or graphics processor employed in a circuit module. [0045] The depiction of Fig.
- Flex circuit 12 shows flex circuit 12 as having first and second fields of ICs 18 with one field of ICs 18 on each side of contacts 20.
- contacts 20 may appear on one or both sides of module 10 depending on the mechanical contact interface particulars of the application.
- Flex circuit 12 may also referenced by its perimeter edges, two of which are typically long (PEiongi and PEi on g 2 ) and two of which are typically shorter (PE S h Or ti and PE s h Or t2) although flex circuit 12 may come in a variety of shapes including square.
- Contact arrays such as array 1 IA are disposed beneath ICs 18 and AMB circuit 19 and are comprised of array contacts 11C.
- An exemplar contact array 1 IA is shown as is exemplar IC 18 to be mounted at contact array 1 IA as depicted.
- the contact arrays 1 IA that correspond to an IC plurality may be considered a contact array set.
- a first plurality of ICs 18 is shown on side 8 of flex circuit 12 and is identified as IC R1 and a second plurality of CSPs is identified as IC R2 .
- IC R1 a second plurality of CSPs
- IC R2 a second plurality of CSPs
- Those of skill will recognize that the identified pluralities of CSPs are, when disposed in the configurations depicted, typically described as "ranks”.
- flex circuit 12 bears a plurality of module contacts allocated in this embodiment into two rows (C R1 and C R2 ) of module contacts 20.
- Fig. 6 depicts an exemplar conductive trace 21 connecting row CR 2 of module contacts 20 to ICs 18. Those of skill will understand that there are many such traces in a typical embodiment. Traces 21 may also connect to vias that may transit to other conductive layers of flex 12 in certain embodiments having more than one conductive layer. In a preferred embodiment, vias connect ICs 18 on side 9 of flex 12 to module contacts 20. An example via is shown as reference 23.
- Traces 21 may make other connections between the ICs on either side of flex 12 and may traverse the rows of module contacts 20 to interconnect ICs. Together the various traces and vias make interconnections needed to convey data and control signals amongst the various ICs and buffer circuits.
- Those of skill will understand that the present invention may be implemented with only a single row of module contacts 20 and may, in other embodiments, be implemented as a module bearing ICs on only one side of flex circuit 12.
- Fig. 7 shows side 9 of flex circuit 12 depicting the other side of the flex circuit shown in Fig. 6. Side 9 of flex circuit 12 is shown as being populated with multiple CSPs 18 and AMB circuit 19.
- Side 9 includes fields Fl and F2 that each include at least one mounting contact array site for CSPs and, in the depicted case, include multiple contact arrays.
- fields Fl and F2 include, in the depicted preferred embodiment, two pluralities of ICs identified in earlier Fig. 6 as ICR 1 and IC R2 .
- Various discrete components such as termination resistors, bypass capacitors, and bias resistors may be mounted on either or both of sides 8 and 9 of flex 12. Such discrete components are not shown to simplify the drawing. Other embodiments may also have fewer or greater numbers of ranks or pluralities of ICs in each field or on a side of a flex circuit.
- edge 16A may take on other shapes devised to mate with various connectors or sockets.
- edge card connectors are well know in the art.
- flex 12 is wrapped around edge 16A of substrate 14 and may be laminated or adhesively connected to substrate 14 with adhesive 30.
- the depicted adhesive 30 and flex 12 may vary in thickness and are not drawn to scale to simplify the drawing.
- the depicted substrate 14 has a thickness such that when assembled with the flex 12 and adhesive 30, the thickness measured between module contacts 20 falls in the range specified for the mating connector.
- flex circuit 12 may be implemented with two flex circuits 12A and 12B instead of one wrapped about end 16 A.
- a flex circuit 12A may be disposed on one side of module 10 while another flex circuit 12B may be disposed on another side of module 10.
- Adhesive 30 is employed to attached flex circuit 12 to substrate 14 and contacts 20 are disposed on each side of module 10.
- contacts 20 need not be on both sides of module 10 and may be exhibited on only one side in configurations.
- Fig. 9 is a cross section view of a module 10 devised in accordance with a preferred embodiment of the present invention. This cross-section is taken through module 10 at a point removed from circuit 19 so that the devices seen in cross section are ICs 18.
- Fig. 10 is a plan view of an alternative embodiment of the present invention that employs plural thermal or radiating clips 100 to assist in thermal management of module 10. Although only two such clips 100 are shown, it should be recognized that any number of such clips may be employed. Clips 100 are preferably comprised of thermally-conductive material and are in thermal contact with ICs 18 or a circuit 19, where a circuit 19 is disposed on the external part of a module 10. Preferably, a single clip 100 is in thermal contact with two CSPs, one on each side of module 10. The thermal contact between clips 100 and ICs 18 or 19 is either realized or enhanced with thermal grease 102 and preferably, clips 100 are devised in a configuration that presents an appreciable surface for thermal transfer. [0054] Fig.
- FIG 11 is a cross-sectional view of an exemplar module 10 fitted with at least one thermal or radiating clip 100.
- clip 100 is in thermal contact with ICs 18. That thermal contact is encouraged with thermal grease 102. It should be noted that thermal grease 102 is optional, but preferred. Depicted clip 100 transits over and is in contact with extension 16T to further increase thermal dissipation from module 10.
- Fig. 12 is an exploded depiction of a flex circuit 12 cross-section according to one preferred embodiment of the present invention.
- the depicted flex circuit 12 has four conductive layers 1201-1204 and seven insulative layers 1205-1211.
- the numbers of layers described are merely those used in one preferred embodiment and other numbers of layers and arrangements of layers may be employed. Even a single conductive layer flex circuit 12 may be employed in some embodiments, but flex circuits with more than one conductive layer prove to be more adaptable to more complex embodiments of the invention.
- Top conductive layer 1201 and the other conductive layers are preferably made of a conductive metal such as, for example, copper or alloy 110.
- conductive layers 1201, 1202, and 1204 express signal traces 1212 that make various connections by use of flex circuit 12. These layers may also express conductive planes for ground, power or reference voltages.
- inner conductive layer 1202 expresses traces connecting to and among various ICs. The function of any one of the depicted conductive layers may be interchanged in function with others of the conductive layers.
- Inner conductive layer 1203 expresses a ground plane, which may be split to provide VDD return for pre-register address signals. Inner conductive layer 1203 may further express other planes and traces. In this embodiment, floods or planes at bottom conductive layer 1204 provides VREF and ground in addition to the depicted traces.
- Insulative layers 1205 and 1211 are, in this embodiment, dielectric solder mask layers which may be deposited on the adjacent conductive layers for example. Other embodiments may not have such adhesive dielectric layers.
- Insulating layers 1206, 1208, and 1210 are preferably flexible dielectric substrate layers made of polyimide.
- any suitable flexible circuitry may be employed in the present invention and the depiction of Fig. 12 should be understood to be merely exemplary of one of the more complex flexible circuit structures that may be employed as flex circuit 12.
- the present invention may be employed to advantage in a variety of applications and environment such as, for example, in computers such as servers and notebook computers by being placed in motherboard expansion slots to provide enhanced memory capacity while utilizing fewer sockets.
- the two high rank embodiments or the single rank high embodiments may both be employed to such advantage as those of skill will recognize after appreciating this specification.
- flex circuit 12 is placed flat and both sides populated according to circuit board assembly techniques known in the art. Flex circuit 12 is then folded about end 16A of substrate 14. Flex 12 may be laminated or otherwise attached to substrate 14.
Abstract
Description
Claims
Priority Applications (1)
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JP2008509993A JP2008541424A (en) | 2005-05-06 | 2006-02-28 | Large capacity thin module system and method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US11/123,721 US20060053345A1 (en) | 2004-09-03 | 2005-05-06 | Thin module system and method |
US11/123,721 | 2005-05-06 | ||
US11/231,418 US7443023B2 (en) | 2004-09-03 | 2005-09-21 | High capacity thin module system |
US11/231,418 | 2005-09-21 |
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WO2006121486A2 true WO2006121486A2 (en) | 2006-11-16 |
WO2006121486A3 WO2006121486A3 (en) | 2007-07-26 |
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US7626259B2 (en) | 2009-12-01 |
US7459784B2 (en) | 2008-12-02 |
KR20080009317A (en) | 2008-01-28 |
US7737549B2 (en) | 2010-06-15 |
WO2006121486A3 (en) | 2007-07-26 |
US7443023B2 (en) | 2008-10-28 |
US20090052124A1 (en) | 2009-02-26 |
JP2008541424A (en) | 2008-11-20 |
US20080094803A1 (en) | 2008-04-24 |
US20090046431A1 (en) | 2009-02-19 |
US20060091529A1 (en) | 2006-05-04 |
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