SI/PI Engineer

Who Are We?

At HyPrix, we're building attritable payload delivery systems for autonomy. Things that fly fast, we're enabling them with conscious software. Replicating the capabilities of expensive conventional frontline systems, we're building the cheapest micro and cruise missile systems on the planet. Built for a war of attrition, built for the era of software-defined warfare, built to cater to the front lines of battlefields where no man should stand in the future.

Learn more about us: https://hyprix.in

What You'll Do

The SI/PI Engineer makes sure that the high-speed interfaces and power delivery networks on HyPrix avionics boards meet their signal quality, timing and noise margins. The position holder runs the simulations, reviews schematics and layouts, and advises the hardware and PCB layout teams on design fixes.

The boards use Ethernet (1G and 2.5G), DDR4, LPDDR4 and eMMC interfaces, and must operate in harsh avionics environments.

• Pre-layout analysis. After schematic release and before layout, simulate each critical interface with IBIS models: topology, termination, drive strength and timing. Define the layout constraints: impedance, length and skew, spacing, via and reference plane rules.
  

• Schematic reviews. Review schematics for SI and PI: terminations, AC coupling, decoupling and power rail filters.
  

• Stack-up. Define and check the stack-up and impedance targets with the PCB layout team and the fabricator.
  

• Post-layout simulation. Extract each routed board in Ansys SIwave and Ansys Electronics Desktop (EDT). Simulate reflections, crosstalk, insertion and return loss, eye diagrams and BER.
  

• Memory interfaces. Analyse DDR4, LPDDR4 and eMMC signal quality and timing margins, with the on-die termination and drive strength settings.
  

• Power integrity. Simulate PDN impedance against the target impedance, and calculate the decoupling capacitor values, quantities and positions. Check DC IR drop on the critical power rails.
  

• Layout reviews. Review layouts for return paths, plane splits, via transitions and decoupling placement. Give clear fix recommendations, and track each fix until it closes.
  

• Simulation models. Get IBIS, S-parameter and SPICE models from the component vendors, check their quality, and keep them in a controlled model library.
  

• Report generation. Generate a simulation report for each board: setup, models, results, margins, pass or fail status and recommended design changes. Write the SI/PI design guidelines for HyPrix boards.
  

• Simulation data control. Save the simulation projects, models, results and reports in the PDM/PLM system, linked to the board and its revision.
  

• Correlation and failures. Compare simulation results with bring-up and lab data, and update the models and the design rules. Support the root-cause investigation of SI, PI and EMI failures.
  

Minimum Experience (Years)

3 years of SI/PI simulation on PCB designs.

HyPrix prefers this experience, but it is not mandatory. Demonstrated capability is more important than years.

Required Skills

• Ansys tools. Hands-on SI and PI simulation with Ansys SIwave and Ansys Electronics Desktop (HFSS and Circuit).
  

• Interfaces. Simulation experience on Ethernet (1G and 2.5G), DDR4, LPDDR4 and eMMC interfaces.
  

• Signal integrity analysis. Eye diagram, BER, crosstalk, reflection, insertion and return loss, and timing margin analysis.
  

• Power integrity analysis. PDN impedance and target impedance, decoupling capacitor calculation and placement, and DC IR drop.
  

• Models. Pre-layout simulation with IBIS models, and practical use of S-parameter and SPICE models.
  

• Fundamentals. Strong knowledge of transmission line theory, electromagnetics, S-parameters, PCB materials, stack-ups and fabrication limits.
  

• Design reviews. Experience to review schematics and PCB layouts for SI and PI, and to give clear and practical fix recommendations to designers.
  

• Reports. Experience to generate clear simulation reports that designers and reviewers can act on.
  

• A bachelor's or master's degree in electronics, electrical or electronics and communication engineering.
  

Advantageous Skills/Qualifications

• Simulation experience on MIPI, 12G/HD-SDI and LVDS interfaces.
  

• Lab measurement with TDR, VNA, BER scopes and high-bandwidth oscilloscopes for eye diagrams, and correlation of measurements with simulation.
  

• Experience with Altair PollEx.
  

• Basic experience to save simulation results in a PDM or PLM system, linked to the design revision.
  

• Experience with Cadence Sigrity, Keysight ADS or Siemens HyperLynx.
  

• Knowledge of EMI/EMC design and MIL-STD-461.
  

• Experience to import and simulate Altium Designer layouts.
  

• Python or MATLAB for simulation automation and reports.
  

• SI/PI experience on aerospace, defence or rugged embedded boards.
  

• A master's degree in electronics or electromagnetics.
  

Why Join HyPrix?

HyPrix is a lean team with no rule book. Each person receives an end goal tied to a real product, and decides how to achieve it.

The SI/PI Engineer decides how HyPrix flight electronics meet their signal and power margins, and works directly with the engineering leadership.