Engineering approach
Control the construction, then verify the result
An impedance value without layer references, geometry and material context is incomplete. The target depends on the relationship among the signal trace, reference plane, dielectric thickness, copper thickness and the laminate's electrical properties.
HXLFAB uses the supplied stack-up and impedance table to prepare a manufacturable construction. Where required, impedance coupons and measurement requirements can be incorporated into the production and inspection plan.
Provide a complete impedance table
- Target impedance and permitted tolerance
- Single-ended or differential structure
- Signal layer and reference layer
- Nominal trace width, spacing and copper weight
- Material, dielectric thickness and coupon requirements