Overview
Definition
Getting & Analysing Inputs is the process of collecting, reviewing, validating, and freezing all design information required before PCB layout begins. This includes electrical, mechanical, manufacturing, assembly, compliance, and customer-specific requirements.
Objective
Create a complete and verified design baseline before placement and routing begin. The objective is to eliminate assumptions, identify risks early, and ensure all stakeholders are aligned before any PCB design activity starts.
Why it matters
Most PCB design failures originate from misunderstood or incomplete inputs rather than routing mistakes. Missing mechanical constraints, incorrect BOM data, undefined stack-up requirements, or unclear critical nets can lead to design rework, prototype failures, schedule delays, and increased development cost.
Inputs
- Schematic
- BOM
- Mechanical Drawings
- DXF Files
- STEP Models
- Interface Specifications
- Electrical Constraints
- Manufacturing Notes
- Assembly Requirements
- Compliance Requirements
- Customer Specific Requirements
- Reference Designs
Outputs
- Approved Input Package
- Critical Component List
- Critical Net List
- Design Assumptions Log
- Open Issues Register
- Input Checklist
- Approved Design Baseline
Common mistakes
- Starting layout before collecting all inputs
- Using outdated schematic revisions
- Ignoring mechanical limitations
- Missing critical net identification
- Assuming stack-up requirements
- Not reviewing reference designs
- Proceeding with unresolved questions
Related steps
Detailed Workflow
Detailed implementation workflow
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- Practical workflow
- Engineer checklist
- Standards
- Industry examples
- Engineer tips
- Common mistakes
Interactive Checklist
Trackable engineer checklist
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Standards
Industry standards reference
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Industry Examples
Industry-specific implementation
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- Automotive
- Industrial
- Medical
- Defense
- Aerospace
- Consumer
- Telecom
- ATE
Board Type Examples
Per board-type guidance
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- Rigid
- Flex
- Rigid-Flex
- RF
- High-Speed
- Metal Core
- HDI
Practical Design Considerations
Lessons learned from real projects
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- Lessons learned
- Real projects
- Case studies
- Design reviews
Tools & Resources
PCB Design Tool
Altium Designer
Schematic, layout and library management.
PCB Design Tool
Cadence Allegro
Enterprise-grade PCB design platform.
PCB Design Tool
Siemens Xpedition
High-end PCB design and constraint management.
PCB Design Tool
KiCad
Open-source schematic and PCB layout suite.
Supporting Tool
Excel
BOM analysis, checklists and trackers.
Supporting Tool
OneNote
Design notes, kickoff minutes and assumptions log.
Supporting Tool
Draw.io
Block diagrams and signal-flow sketches.
Supporting Tool
PLM System
Revision-controlled inputs and release management.
Supporting Tool
SVN / Git
Version control for design files and documentation.
Supporting Tool
PDF Review Tools
Mark up mechanical drawings and review comments.
Step Tool
Input Readiness Score Tool
Input Readiness Score Tool
Score how complete your design inputs are before starting layout.
Knowledge Check
Optional self assessment — no pass/fail, no mandatory completion.
1. Have all required inputs been collected?
2. Have critical components been identified?
3. Have critical nets been identified?
4. Have mechanical constraints been reviewed?
5. Has the design baseline been frozen?
Completion
Mark Step 1 as complete
Finish the checklist or self-assess, then mark complete.