Package Layout & Substrate Design Engineer

Project

Work done for a product or program.

• Route substrate signal, power and ground layers to the layer-assignment plan, holding differential pair skew, spacing and impedance targets.
• Shape power and ground planes and split references to satisfy PI current density and SI return-path continuity requirements.
• Build and maintain constraint sets in Allegro or Xpedition constraint managers, including net classes, impedance rules and length matching.
• Generate copper balance and dummy metal fill to control plating uniformity and substrate warpage.
• Run interactive and batch DRC, resolving spacing, annular ring, solder mask registration and antipad violations.
• Iterate rapidly on layout changes driven by SI/PI simulation feedback and by die bump map revisions.

Function

Work that keeps the discipline running: methods, tools, suppliers and people.

• Place and stagger microvias, plated through vias and via-in-pad structures within supplier aspect-ratio and registration capability.
• Produce fabrication documentation — layer artwork, drill charts, stack-up drawing, panel array and fiducial definition — for the substrate supplier.
• Maintain CAD library parts, padstacks and technology files for each substrate supplier and technology node.
• Support panel utilisation reviews with the substrate supplier to improve units per panel and reduce cost.

Project

1. Produce and hand over the role's key deliverables
   • Released substrate layout database
   • Layer artwork, drill files and fabrication drawing set
   • Constraint manager rule set per net class
   • Copper balance and dummy fill plan
   • Padstack and CAD technology library updates
   • Panel array and utilisation drawing
2. Implement the layoutGeneral
   • Floorplan and plan the power grid
   • Place, build the clock tree and route
   • Run extraction and analysis
3. Close sign-offGeneral
   • Close timing at every corner
   • Clear DRC and LVS
   • Complete the sign-off checklist

Function

1. Maintain the flowGeneral
   • Update scripts and flow settings
   • Qualify new tool versions
2. Share knowledgeGeneral
   • Document fixes for recurring issues
   • Train newer engineers on the flow