Podcasts · The Hardware Podcast with Fexingo: Chips, Devices, and Electronics Engineering Conversations

Why Chip Designers Are Rethinking Power Delivery Networks

15 Jun 2026 · 11 min · S2 E52

Episode 52 of The Hardware Podcast dives into the hidden grid inside every chip: the power delivery network, or PDN. Lucas and Luna explore why traditional on-chip power grids are hitting a wall as transistors shrink below 3 nanometers, and how the industry is turning to a radical alternative called 'buried power rails.' Anchored by a real-world example from a recent IEEE paper on Intel's 18A process, they explain how moving power wires to the back of the chip frees up space for data signals and cuts voltage droop by 15 percent. The conversation covers the manufacturing challenges of building trenches in silicon, the trade-off between resistance and capacitance, and why this shift could reshape chip design for the next decade. If you've ever wondered how your smartphone's processor stays stable under full load—or why future chips might look completely different under a microscope—this episode gives you the concrete engineering story behind the transition.

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