Sr. High-Speed SI/PI Design Engineer

Sr. High-Speed SI/PI Design Engineer Signal Integrity (SI): Model and simulate high-speed interfaces (e.g., 224G-PAM4 SerDes). Perform channel simulations (TX-to-RX) across packages and PCBs. Work with IBIS-AMI, S-parameter models, and tools such as Ansys HFSS, Keysight ADS, or Cadence Sigrity. Optimize interconnects to meet eye diagram, BER, and insertion/return loss targets. Validate compliance with standards such as IEEE 802.3df/802.3dj and UAL. Power Integrity (PI): Analyze and design PDN (power delivery network) for core and I/O voltages. Ensure low impedance across required frequency range using de-cap optimization and VRM modeling. Use tools such as PowerSI, PowerDC. Package/Board Design Collaboration: Co-design with package layout engineers (substrate, flip-chip, organic packages). Define breakout strategies for dense BGA interfaces. Guide stack‑up, via, and routing constraints in both package and board to enable 224G signaling. Experience with advanced package design is a plus. Cross-Functional Collaboration: Interface with ASIC, system, layout, and test teams. Provide SI/PI guidelines and design constraints to enable electrical compliance. Support bring-up and debug using scopes, VNAs, TDRs, etc. Skills & Tools Simulation Tools: SI – ADS, HFSS, ADK, HSPICE; PI – PowerSI, PowerDC. Analysis: Time-domain and frequency-domain signal analysis, crosstalk, jitter, eye closure, PDN impedance. Fabrication Knowledge: HDI PCB and advanced package materials (e.g., Megtron 7, Ajinomoto), low-loss stack‑up optimization, via-in-pad, via stub mitigation. Qualifications BS/MS in Electrical Engineering or a related field. 5+ years of experience in Signal Integrity. Estimated Min Rate : $200,000.00 Estimated Max Rate : $280,000.00 Salary range + equity Benefits Medical, prescription, dental & vision benefits (for employees working 20+ hours per week) Health Savings Account (HSA) (for employees working 20+ hours per week) Life & disability insurance (for employees working 20+ hours per week) MetLife voluntary benefits Employee assistance program (EAP) 401(k) retirement savings plan Direct deposit & weekly e-payroll Referral bonus programs Certification and training opportunities Equal Opportunity Employer Yoh, a Day & Zimmermann company, is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. For California applicants, qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance and the California Fair Chance Act. All of the material job duties described in this posting are job duties for which a criminal history may have a direct, adverse, and negative relationship potentially resulting in the withdrawal of a conditional offer of employment. It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Visit to contact us if you are an individual with a disability and require accommodation in the application process. #J-18808-Ljbffr YOH Services LLC