Intel‘s Advanced Packaging Innovations: Scaling Chiplet Integration for the AI Era
The relentless demand for increased computing power, especially in the burgeoning field of Artificial Intelligence (AI), is driving a revolution in chip packaging. Simply shrinking transistors is no longer enough. Instead, the industry is turning to advanced packaging techniques to integrate multiple silicon dies – known as chiplets – into a single, powerful package. Intel is at the forefront of this innovation, unveiling a suite of technologies designed to overcome the limitations of traditional packaging and unlock unprecedented levels of performance and density. This article delves into these advancements, exploring how intel is tackling the challenges of interconnect density, power delivery, thermal management, and manufacturing scalability to compete in the rapidly evolving landscape of advanced packaging.
The Challenge: Beyond Traditional Interconnects
For years, connecting silicon dies has relied on organic substrates. While cost-effective, these substrates quickly hit a wall when it comes to the density of connections required for complex, multi-chiplet designs. Increasingly, the need for higher bandwidth and lower latency demands a more sophisticated approach. The key lies in creating more pathways for data and power to flow between the chiplets.
intel’s EMIB and EMIB-T: Bridging the Gap
Intel’s solution, introduced over five years ago, is a groundbreaking technology called Embedded Multi-die Interconnect Bridge (EMIB).Rather than relying solely on the organic substrate, EMIB embeds a small silicon ”sliver” within the package. This sliver is meticulously etched with a dense network of interconnects, considerably exceeding the connection density achievable with traditional organic substrates.
at the recent Electronic components and Technology conference (ECTC), Intel showcased the latest evolution of EMIB: EMIB-T. This iteration builds upon the foundation of EMIB by adding through-silicon vias (TSVs).TSVs are vertical copper connections that pierce through the silicon, providing a direct pathway for power delivery from the circuit board to the chips above. This bypasses the longer,more resistive routes through the EMIB itself,dramatically reducing power loss and improving efficiency.
Furthermore, EMIB-T incorporates a dedicated copper grid functioning as a ground plane. This crucial addition minimizes noise in the power delivery network,a critical factor as AI processors cycle through periods of intense activity and fluctuating workloads.
“it sounds simple, but this is a technology that brings a lot of capability to us,” explains Rahul Manepalli, Intel’s Vice President of substrate Packaging Technology. He highlights the potential of these technologies, stating that a single package could integrate silicon equivalent to more than 12 full-size dies – a staggering 10,000 mm2 of silicon – utilizing 38 or more EMIB-T bridges. This level of integration is essential for building the next generation of high-performance computing systems.
Overcoming Thermal and Manufacturing Hurdles
Increasing chiplet density isn’t without its challenges. Two notable hurdles are thermal expansion mismatch and heat dissipation.
Thermal Compression Bonding: Managing Expansion
Traditional die-to-substrate attachment relies on solder bumps. Though, silicon and organic substrates expand at different rates when heated. This differential expansion limits the achievable density of solder bumps (pitch) and makes it challenging to reliably manufacture large substrates populated with numerous dies – precisely what’s needed for advanced AI processors.
Intel’s new low-thermal-gradient thermal compression bonding technology addresses this issue by making the thermal expansion mismatch more predictable and manageable. This allows for the creation of larger substrates and, crucially, enables a significant increase in connection density, down to approximately one connection every 25 micrometers.This finer pitch unlocks even greater integration potential.
Integrated Heat Spreader: Efficient Thermal Management
as chiplet density increases, so does heat generation.effectively removing this heat is paramount to maintaining performance and reliability. An integrated heat spreader (IHS) is a critical component in this process, but creating a sufficiently large and flat IHS for these complex packages presents a significant engineering challenge.Package substrate warping and potential non-flatness of the IHS itself can impede thermal contact with the underlying dies.Intel’s innovative solution involves assembling the IHS from multiple parts rather than a single monolithic piece.This modular approach allows for the incorporation of stiffening components, ensuring a consistently flat and even surface for optimal thermal transfer. “Keeping it flat at higher temperatures is a big benefit for reliability and yield,” Manepalli emphasizes.
The Competitive Landscape and Future Outlook
while these technologies remain in the research and development phase, Intel recognizes the urgency of bringing them to market. The company is strategically positioning