Electromagnetic Via Enables Through-Chip Wireless Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inter-chip communication methods, such as conductive wiring and VCSELs, face limitations in bandwidth and power dissipation due to topological constraints and RC delays, necessitating a more efficient form of wireless communication that can scale with on-chip frequency and feature size.
Innovation Solution
The development of an integrated circuit chip with an electromagnetic via that enables non-conductive signaling through the chip, allowing for capacitive, inductive, or optical communication between chips, facilitating two-sided wireless communication and enabling three-dimensional chip stacking with improved thermal management and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional conductive wiring and VCSELs are used for inter-chip communication, then reliable interconnections are provided, but bandwidth is limited due to topological constraints and RC delays
Solution Approach 1:
The patent replaces conventional conductive electrical interconnections with electromagnetic radiation-based communication. Instead of using physical wire bonds and conductive pathways that suffer from RC delays and topological limitations, the invention employs electromagnetic fields to transmit signals through and between chips, eliminating the mechanical/conductive constraints that limit bandwidth while maintaining reliable communication through field-based coupling.
Solution Approach 2:
The patent transitions from two-dimensional planar interconnect architectures to three-dimensional electromagnetic field-based communication. By utilizing electromagnetic radiation that can penetrate through chip substrates and enabling stacking configurations, the invention adds a vertical dimension to communication pathways, allowing signals to travel through the thickness of chips and enabling multi-layer chip stacks with improved bandwidth scalability.
2Ease of manufacture
If conventional conductive wiring is used for inter-chip communication, then manufacturing compatibility is maintained, but power dissipation increases due to low-impedance line driving requirements
Solution Approach 1:
The patent changes the fundamental parameter of signal transmission from conductive current flow to electromagnetic radiation. This parameter change enables high-impedance coupling between chips, which dramatically reduces the current requirements for signal transmission. The electromagnetic via structure allows capacitive or inductive coupling that operates at high impedance, eliminating the need to drive low-impedance lines and thereby reducing power dissipation while remaining compatible with standard CMOS fabrication processes.
3Productivity
If chips are stacked in three dimensions with active sides facing each other, then communication efficiency is improved, but thermal management becomes more challenging
Solution Approach 1:
The patent inverts the conventional chip stacking approach where active sides face each other for direct coupling. Instead, the invention configures chip stacks with active sides facing opposite directions (one chip's active side up, the other's active side down), with electromagnetic vias penetrating through the substrate to enable communication. This inversion separates the active circuitry from the thermal interface, allowing heat to be dissipated more effectively from the active regions while maintaining communication efficiency through the electromagnetic via structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides increased bandwidth and power efficiency by allowing for scalable, two-sided wireless communication between chips, enabling three-dimensional chip stacks with enhanced thermal management and the ability to reassemble or replace individual chips, while reducing cross-talk noise and aligning electronic structures for improved signal integrity.
Implementation Method 1
Capacitive coupling allows signal densities two orders of magnitude greater than traditional off-chip communication using wire-bonding or traditional ball-bonding
Implementation Method 2
The electromagnetic via operates by facilitating non-conductive signaling through the integrated circuit chip
Implementation Method 3
optical interconnections and transceivers are now also being used to provide reliable interconnections between electronic components
Data Source
AI summary
One embodiment of the present invention provides an integrated circuit chip, including an active face upon which active circuitry and signal pads reside, and a back face opposite the active face. The integrated circuit chip additionally comprises an electromagnetic via that facilitates communication between signal pads on the integrated circuit chip and signal pads on a second integrated circuit chip. The electromagnetic via couples a signal pad on the active face of the integrated circuit chip to the back face of the integrated circuit chip so that the integrated circuit chip can communicate with the second integrated circuit chip while the back face of the integrated circuit chip is adjacent to the active face of the second integrated circuit chip. Moreover, the electromagnetic via operates by facilitating non-conductive signaling through the integrated circuit chip.