Principal SI/PI, Package and Power Delivery Engineer

Role Overview 

As an SI/PI, Package and Power Delivery Engineer at Tylsemi, you will own signal integrity, power integrity, and package/PDN co-design across chip, package, and board interfaces. You will work closely with SoC, physical design, analog, package, board, and validation teams to ensure robust high-speed links, stable power delivery, and predictable signoff from early architecture through tapeout and bring-up. This role  is ideal for engineers who enjoy cross-domain problem solving and turning complex electrical constraints into clean, manufacturable solutions. 

What You’ll Do 

• Drive SI/PI methodology and execution from early planning through signoff for high-speed interfaces and power delivery networks 

• Perform package/board/chip co-design: define stackups, routing constraints, via strategies, reference planes, and return-path integrity 

• Model and analyze high-speed channels (e.g., SerDes, DDR, PCIe, USB, Ethernet) including insertion/return loss, crosstalk, jitter, eye margins, and equalization tradeoffs 

• Build and validate electrical models (IBIS/IBIS-AMI, S-parameters, SPICE) and ensure model correlation and version control hygiene 

• Own PDN design and analysis across die/package/board: impedance targets, decap strategy, anti-resonance mitigation, and rail stability 

• Run PI signoff including DC/AC IR drop, EM, dynamic droop/noise, and power/ground bounce; drive fixes with clear, reviewable action plans 

• Partner with physical design and signoff teams on power grid architecture, bump/ball planning, current density limits, and rail partitioning 

• Collaborate with package engineering on substrate routing, escape, ballout, and manufacturability constraints; review and approve package design deliverables 

• Define and enforce design rules/constraints for routing, spacing, shielding, length matching, and reference plane transitions 

• Support lab bring-up and correlation: translate silicon/package/board measurements into model updates and design improvements 

• Create and maintain automation, checks, and reporting (Python/Tcl or equivalent) to improve predictability, repeatability, and execution speed 

• Contribute to tapeout readiness: documentation, checklists, design reviews, and root-cause analysis to prevent recurrence 

What We’re Looking For 

• Hands-on experience delivering SI/PI and package/PDN solutions for complex SoCs (scope aligned to level of experience) 

• Strong fundamentals in transmission lines, S-parameters, impedance, return paths, coupling/crosstalk, and power delivery behavior across frequency 

• Ability to translate system requirements into actionable constraints and to drive closure across multiple teams and design stages 

• Methodical debug skills: clear problem statements, data-driven root cause, and practical mitigation plans 

• Strong communication and engineering hygiene: reproducible analyses, clean documentation, and review-friendly deliverables 

Required Skills 

• Signal Integrity (SI) analysis for high-speed interfaces 

• Power Integrity (PI) / PDN design and analysis (chip-package-board) 

• Package and power delivery co-design (substrate/ballout/bumps, stackup and routing constraints) 

• Electrical modeling (S-parameters, SPICE, IBIS/IBIS-AMI) and correlation mindset 

• Cross-functional execution with SoC/PD/analog/package/board/validation teams 

Nice to Have 

• Experience with industry tools for SI/PI and package analysis (e.g., HFSS, SIwave, ADS, HSPICE/Spectre, PowerSI, Clarity, Ansys RedHawk/Voltus or equivalents) 

• DDR/LPDDR and SerDes compliance experience (channel budgets, jitter/noise decomposition, margining) 

• Advanced packaging exposure (2.5D/3D, interposers, chiplets, HBM, CoWoS/EMIB-like concepts) and related SI/PI challenges 

• Thermal-awareness in PDN/package decisions and collaboration with thermal/mechanical teams 

• Experience defining signoff criteria, templates, and reusable flows across programs 

Success in This Role Looks Like 

• Predictable SI/PI closure with clear milestones, risk tracking, and minimal late-stage surprises 

• Robust package/PDN solutions that meet impedance/noise/jitter targets and scale cleanly to production 

• Fast, high-quality debug and mitigation of SI/PI issues with strong cross-team alignment 

• Well-documented, reproducible analyses and signoff artifacts that improve team velocity and tapeout readiness