Principal Signal Integrity Engineer

About The Role

As the Senior Staff SI/PI Engineer, you will be the technical authority responsible for the electrical integrity of d-Matrix’s high-performance AI compute platforms. In an environment where we are pushing 112G/224G SerDes and delivering thousands of Amps to multi-chip modules (MCM), your role is critical to ensuring that our "Digital In-Memory Computing" architecture translates into stable, manufacturable, and world-class hardware.

Key Responsibilities

• Drive the SI/PI strategy for next-generation AI accelerators, focusing on high-speed interfaces (PCIe Gen6/7, CXL, LPDDR5) and custom Chiplet-to-Chiplet interconnects.
• Lead the modeling and analysis of complex multi-chip packages, including interposer routing, micro-bump parasitic extraction, and die-to-die (D2D) link budgeting.
• Design and optimize the Power Delivery Network (PDN) to meet stringent Z_Target requirements.
• Perform transient analysis to ensure voltage stability during massive AI workload swings.
• Perform comprehensive channel simulations (pre- and post-layout) using IBIS-AMI models.
• Define jitter, crosstalk, and loss budgets (insertion/return loss) for 112G+ channels.
• Lead the "Gold Suite" validation in the lab. Correlate simulation results with VNA, TDR, and high-speed oscilloscope measurements to close the loop on design accuracy.
• Translate complex simulation findings into actionable physical layout constraints for the PCB Design team, specifically for advanced stack-ups and high-density routing.
• Act as the subject matter expert, guiding hardware and layout engineers on SI/PI best practices and state-of-the-art mitigation techniques (e.g., skip-vias, voiding, material selection).

Required Qualifications

• Education: MS/PhD in Electrical Engineering or a related field with a focus on Electromagnetics or Signal Integrity.
• Experience: 12+ years in SI/PI design for high-performance networking, GPUs, or server platforms.
• Simulation Mastery: Expert-level proficiency in industry-standard tools: SI: Ansys HFSS, Cadence Sigrity, Keysight ADS, or Simbeor; PI: Ansys SIwave, Cadence PowerSI, or CST.
• High-Speed Expertise: Proven track record with 112G SerDes and high-speed memory architectures. Deep understanding of PAM4 signaling and FEC (Forward Error Correction) impact on link margins.
• Measurement Skills: Hands-on experience with 50GHz+ VNAs, TDRs, and real-time/sampling oscilloscopes.

Preferred Skills

• Knowledge of PCB Material Science (e.g., glass weave effects, skin effect loss, copper roughness modeling).
• Experience with Python or MATLAB for post-processing large simulation datasets and automating sweep analysis.
• Familiarity with OCP (Open Compute Project) hardware specifications for AI modules.