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IC Design Flow · Topic 8 of 9

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IC Design FlowLesson 8 of 9

Signoff

The final checks that confirm the design is correct and manufacturable.

What you’ll learn

  • What signoff verifies
  • DRC and LVS
  • Timing/power signoff

Why it matters

Signoff is the last gate before committing millions to manufacturing.

Explanation

Signoff runs exhaustive checks: design-rule checking (DRC) confirms the layout obeys the foundry's rules; layout-versus-schematic (LVS) confirms the layout matches the netlist; static timing analysis confirms speed; plus power, IR-drop, and reliability checks.

Only after clean signoff does the design go to tapeout.

Visual explanation

A checklist of signoff checks (DRC, LVS, STA, power) all turning green.

Key terminology

DRC
Design-rule check against foundry rules.
LVS
Layout-versus-schematic comparison.
STA
Static timing analysis.

Example

A DRC violation (two wires too close) must be fixed before tapeout.

Common mistakes

Real-world application

Foundries supply the rule decks that signoff tools check against.

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Signoff

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Tapeout

IC Design Flow

Handing the finished layout to the foundry to be manufactured.

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