Impedance Control Basics
Trace width, dielectric height and Dk set characteristic impedance; control them or accept reflections.
The three knobs
Width, height and Dk are the levers you tune.
Controlled vs nominal
Spec a tolerance, not just a number, and verify by coupon.
Test coupons
A coupon on the panel proves the stack-up met target.
Key Takeaways
Key Takeaways
- Tune width, height and Dk.
- Spec impedance tolerance, not just value.
- Verify with test coupons.
