Senior Signal Integrity Engineer - High-Speed I/O

Amphenol Corporation; Nashua (NH); On-site; USD 110,000 - 180,000; Full time

Job summary

Amphenol Communications Solutions in Nashua, NH seeks a Senior Signal Integrity Engineer for next‑gen Active Electrical Cables and high‑speed modules. You’ll own electrical design, simulation, validation, and optimization from concept to production for 224G PAM4 and beyond.

Responsibilities include SI analysis, channel budgets, AEC development, DSP/retimer integration, and lab validation with VNAs, TDRs, and BERT.

Qualifications

• BS, MS, or PhD in Electrical Engineering or related field.
• 5+ years of experience in high-speed signal integrity engineering.
• Strong understanding of high-speed serial interfaces and networking systems.
• Experience with 56G, 112G, and preferably 224G PAM4 technologies.
• Experience developing products using DSPs and retimers.
• Experience with active copper cables AEC, DACs, ACCs.
• Strong understanding of PCB design, stack-ups, via optimization, and transmission line theory.
• Experience with S-parameter analysis and channel modeling.

Responsibilities

• Develop channel architectures for high-speed copper and optical interconnects.
• Run pre-layout and post-layout SI simulations for channels at 224G PAM4 and beyond.
• Analyze insertion loss, return loss, crosstalk, impedance, and channel compliance.
• Optimize PCB stack-ups, via structures, interfaces, and cable constructions.
• Develop channel budgets and link performance models.
• Design Active Electrical Cable (AEC) architecture using DSPs/retimers.
• Simulate DAC, ACC, and AEC channels.
• Collaborate with cable suppliers on manufacturability and performance.
• Evaluate DSP/retimer-based channels and assess equalization, CTLE, DFE.
• Support device bring-up, characterization, and compliance testing.
• Correlation between simulation and measurements; lab validation.
• Characterize channels using VNAs, TDRs, oscilloscopes, BERT.
• Analyze eye diagrams, COM, SNDR, BER, jitter.
• Lead cross-functional decisions with PCB/mechanical/thermals teams.

Skills

High-speed SI

DSPs & Retimers

S-parameter analysis

Channel modeling

PCB design

Eye diagrams

Transmission line theory

Education

BS, MS, or PhD in Electrical Engineering or related field

Tools

Ansys HFSS

IEEE channel compliance

Job description

Amphenol Communications Solutions in Nashua, NH seeks a Senior Signal Integrity Engineer for next‑gen Active Electrical Cables and high‑speed modules. You’ll own electrical design, simulation, validation, and optimization from concept to production for 224G PAM4 and beyond.

Responsibilities include SI analysis, channel budgets, AEC development, DSP/retimer integration, and lab validation with VNAs, TDRs, and BERT.