You will own the power distribution network from voltage regulator output to die bump - impedance, IR drop, droop and decoupling across package and board. Senior IC role: you own the PDN numbers that power delivery, SI and the package team design against. What you will work on: - PDN design and closure for a multi-die AI accelerator package - DC IR, AC impedance, transient droop and electro-thermal analysis across die, package and board - Decoupling strategy and optimisation across on-die, package and board tiers - Package-board anti-resonance identification and mitigation - PDN noise to jitter translation, closed back into the SI budget Responsibilities: - Analysis & closure: Build and close DC IR, electro-thermal, AC impedance and transient PDN analysis from VR output through package to die bump. Set target impedance per rail and hold the design to it. - Chip power models: Work with CPM and workload current profiles to size on-die, package and board decoupling, and to predict droop across all three droop timescales. - Resonance & mitigation:



Identify package-board anti-resonance and cavity behaviour, and drive the plane, via and decap changes that mitigate it. - SI coupling: Translate PDN noise into jitter through PHY supply sensitivity, and feed the result back into the channel budget. - Vendor & validation: Drive CPM and model requirements with IP, PHY and package vendors. Correlate against PDN impedance measurement and on-die droop telemetry, and support bring-up and power debug. Requirements: - 8+ years in power integrity for high-speed digital systems, including package-level PDN work - Hands-on with PDN extraction and simulation tools - Ansys SIwave/HFSS, Cadence Sigrity/Clarity or equivalent - Real experience with DC IR, target impedance, transient droop and decap optimisation on a high-current rail - Working knowledge of chip power models and how to apply workload current profiles - Comfortable reading a package substrate stackup and bump map, and reasonin

📌 Senior Power Integrity Engineer (Barcelona)
🏢 Semidynamics
📍 Barcelona