Lower Than 5% Impedance Tolerance Achievable With Candors Process

With today’s digital signal processing using higher clock frequencies and shorter signal transition times PCB tracks need to be considered as transmission lines with regulated impedance. Impedance is controlled by the dimensions, materials, and configurations of the PCB.

How We Achieve Our Tight Tolerances

Candor uses Polars CITS500s Controlled Impedance Test System, with this system Candor is able to determine the characteristic impedance of traces to ensure products meet customer standards. Candor can reach up to 2% tolerance of impedance controlled traces thanks to Panel Plating and Continuous Foil Lamination.

Uniform Plating

Candor uses a panel plating process that gives uniform plating across all boards which is needed for uniform signal propagation, keeping impedance tolarances withing required levels.

Dielectric Layer Consistency

To get a smooth and consistent dielectric layer Candor uses continuous foil lamination with induction heating to maintain temperature across B-Stage pre-pregs. This results in a consistent dielectric layer thickness, allowing for uniform signal propagation with minimal track impedance variation.

What Is the Application?

Impedance Control should be considered when dealing with high speed/frequency digital and analog circuits. Designers specify these types of PCBs whenever the edge speeds of digital signals are faster than 1ns, or analog signals climb above 300MHz.

Impedance Controlled Board Reviews

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