Controlled impedance is essential for high-speed interfaces, RF traces, and differential pairs. Manufacturers need the target impedance, layer stack, copper thickness, and dielectric assumptions to build it correctly.
What you should provide
- Target impedance values
- Single-ended or differential structure
- Preferred stackup if available
- Material requirements
Impedance control is not just a routing setting inside CAD. It depends on real manufacturing parameters, so your PCB supplier should confirm the final stackup before production.
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