1. Field of the Invention
Disclosed embodiments relate to integrated circuit (IC) packaging.
2. Description of the Related Art
A circuit socket is a mechanical component that provides mechanical and electrical connections between a microprocessor package and a printed circuit board (PCB). The socket can allow the circuit to be replaced without soldering.
Common sockets can have retention clips that apply a constant force, which must be overcome when a device is inserted. For chips with a large number of pins, either zero insertion force (ZIF) sockets or land grid array (LGA) sockets may be used instead. These designs can apply a compression force once either a handle (for ZIF type) or a surface plate (LGA type) is put into place.
High speed and high power socketed chips can require a low inductance socket pin to minimize supply voltage droop on socket pins for power delivery and to lower impedance of high speed signals such as high speed memory interface (double data rate) to values closer to 50 ohm. The socket can be the main bottleneck of channel performance. This bottleneck can result in a voltage droop during power delivery, degradation of signal integrity and closure of the eye aperture at the receiver.
As shown, the socket pin 100, the free socket pin 110, and the fully deflected socket pin 130 have stubs 102, 112, 132. For example, the stubs 102 of the first socket pin 100 can be on the opposite side of the single path 104. Electromagnetic waves can travel back and forth along the stub, which can cause loss. The electricity can reverse direction on the socket pin 100. There can be significant resistance and inductance as the need for power delivery increases.
The disclosure is directed to a looped socket pin.
A surface mount socket pin for integrated circuit packaging can comprise a closed loop conductor configured to couple a first conductive element to a second conductive element. The closed loop conductor can be configured to provide two paths between the first conductive element and second conductive element. The central region of the closed loop conductor can be configured to engage with a plurality of symmetrical bumps in a mold to secure the closed loop conductor, and wherein the closed loop conductor is elastic.
A method for creating a surface mount socket pin for integrated circuit (IC) packaging can comprise coupling a first conductive element to a second conductive element. A closed loop conductor can be configured to provide two paths between the first conductive element and second conductive element. A central region of the closed loop conductor can be configured to engage with a plurality of symmetrical bumps in a mold to secure the closed loop conductor, wherein the closed loop conductor is elastic.
An apparatus can comprise a processor configured to create a surface mount socket pin for IC packaging. The apparatus can comprise means for coupling a first conductive element to a second conductive element. The apparatus can comprise means for configuring the closed loop conductor to provide two paths between the first conductive element and second conductive element. The apparatus can comprise means for configuring the central region of the closed loop conductor to engage with a plurality of symmetrical bumps in a mold to secure the closed loop conductor, wherein the closed loop conductor is elastic.
A non-transitory computer-readable storage medium comprising instructions, which, when executed by an apparatus, cause the apparatus to perform operations to create a surface mount socket pin for integrated circuit packaging. The non-transitory computer-readable storage medium comprises a processor configured to create a surface mount socket pin for IC packaging. The non-transitory computer-readable storage medium can comprise logic configured to couple a first conductive element to a second conductive element. The non-transitory computer-readable storage medium can comprise logic configured to configure the closed loop conductor to provide two paths between the first conductive element and second conductive element. The non-transitory computer-readable storage medium can comprise logic configured to configure the central region of the closed loop conductor to engage with a plurality of symmetrical bumps in a mold to secure the closed loop conductor, wherein the closed loop conductor is elastic.
Some advantages may include the ability to lower pin inductance, impedance and remove stub.
A more complete appreciation of aspects of the disclosure and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings which are presented solely for illustration and not limitation of the disclosure, and in which:
Various aspects are disclosed in the following description and related drawings. Alternate aspects may be devised without departing from the scope of the disclosure. Additionally, well-known elements of the disclosure will not be described in detail or will be omitted so as not to obscure the relevant details of the disclosure.
The words “exemplary” and/or “example” are used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” and/or “example” is not necessarily to be construed as preferred or advantageous over other aspects. Likewise, the term “aspects of the disclosure” does not require that all aspects of the disclosure include the discussed feature, advantage or mode of operation.
Further, many aspects are described in terms of sequences of actions to be performed by, for example, elements of a computing device. It will be recognized that various actions described herein can be performed by specific circuits (e.g., application specific integrated circuits (ASICs)), by program instructions being executed by one or more processors, or by a combination of both. Additionally, these sequence of actions described herein can be considered to be embodied entirely within any form of computer readable storage medium having stored therein a corresponding set of computer instructions that upon execution would cause an associated processor to perform the functionality described herein. Thus, the various aspects of the disclosure may be embodied in a number of different forms, all of which have been contemplated to be within the scope of the claimed subject matter. In addition, for each of the aspects described herein, the corresponding form of any such aspects may be described herein as, for example, “logic configured to” perform the described action.
As shown, the path 306 can have a minimum deformation in comparison to the coupling portion 310 while the path 306 can move towards to 310 under a compression load. The longitudinal deformation of the loop connector can be enabled by the transverse deformation of the securing portion 308. For example, the path 306 may have a deformation of approximately −0.094 mm longitudinally while the securing portion 308 can have a deformation of approximately −0.084 mm to −0.010 mm and the coupling portion 310 can have no deformation. In some embodiments, the path 306 can move towards the conductive element 312 during compression, while the securing portion 308 can move away from the conductive element 312 during compression.
In some embodiments, if 55 gram force is applied, the total deformation can be 190 μm, For example, this deformation can be used to generate a desired mechanical contact between the pin and an integrated circuit device. The geometry of the closed loop conductor 300 can be 180 μm wide with a 20 μm film thickness.
In some embodiments, the path 402 can have a height of 0.762 mm. The fillet 404 between the path 402 and the securing portion 406 can have a radius of 0.200 mm. The securing portion 406 can have a radius that is the same as the fillet 404. The securing portion 406 can have 0.254 mm radius. Similarly, the length 410 between the central region of the closed loop conductor 400 to the path can be 0.300 mm The length 412 of the coupling portion can be 0.554 mm The height 414 is shown in
In some embodiments, the closed loop conductor 400 can be formed in a process. For example, a casting or a drawing process can make a pipe. For example, molten metal can be poured into a cast to form the closed loop conductor. In a drawing process, molten metal can be stretched using tensile force; to make a pipe for the closed loop conductor, a plugged die can be used to form a hollow portion in the pipe. The pipe with a loop-form x-section can be created. The pipe can be cut to form the looped socket pin. In some embodiments, a mold is created with a bump in the middle; and the closed loop conductor is pressed into the mold once the mold is created.
In some embodiments, the closed loop conductor 500 has a narrower width in the central region than outer regions of the closed loop conductor 500. In some embodiments, the symmetrical bumps have a circular shape that has a smaller diameter than a length of the central region of the closed loop conductor.
As shown in Table 1, when the closed loop conductor 202 of
As shown in Table 2, when the closed loop conductor 202 of
In some embodiments, the method for creating the surface mount socket pin for IC packaging can further comprise creating a cast and pouring molten metal into the cast. In some embodiments, the method for creating the surface mount socket pin for IC packaging can further comprise creating a pipe with a loop-form and cutting the pipe. In some embodiments, the method for creating the surface mount socket pin for IC packaging can further comprise creating a mold with a bump in the middle and pressing the closed loop conductor into the mold once the mold is created. In some embodiments, the method for creating the surface mount socket pin for IC packaging can further comprise coupling the closed loop conductor with the plurality of symmetrical bumps, wherein a force applied during the coupling does not exceed an elasticity of the closed loop conductor. Similarly, in some embodiments, the method for creating the surface mount socket pin for IC packaging can further comprise decoupling the closed loop conductor with the plurality of symmetrical bumps, wherein a force applied during the decoupling does not exceed an elasticity of the closed loop conductor.
In
Those of skill in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
Further, those of skill in the art will appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The various illustrative logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The methods, sequences and/or algorithms described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of non-transitory computer-readable storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in an electronic object. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary aspects, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, DVD, floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
While the foregoing disclosure shows illustrative aspects of the disclosure, it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the aspects of the disclosure described herein need not be performed in any particular order. Furthermore, although elements of the disclosure may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.