Impedance-controlled PCB

Impedance-controlled PCB

Impedance-controlled PCB are used at high frequencies and steep switching edges to ensure signal integrity. Because through reflections the signals can be superimposed resulting in sporadic and non-reproducible errors
and thus can lead to unreliability of the entire assembly. With Becker & Müller you can rely on an experienced specialist in manufacturing of impedance-controlled PCB.

How are impedance-controlled PCB made?

In order to counteract the above described capacitive effects the desired parameters – such as trace dimensions, layer structure or base material – are checked and if necessary adjusted using a special software from the market leader Polar instruments GmbH. That means: These parameters are manageable in PCB production. Due to high process reliability in production at Becker & Müller, compliance with the industry- standard tolerance (of the impedance) of ±10 % can be guaranteed. Narrower tolerance claims can be checked for feasibility after consultation.

A final impedance-check using representative test coupons on the PCB panel provides ultimately the exact values. The specified target impedance is compared with the measured actual values and the tolerances. The result is finally recorded in a test report.

What exactly is impedance?

The impedance of a wire or a layouted trace describes the wave resistance and significantly determines the behavior at higher and highest frequencies signals. It is therefore also responsible for the slopes of pulses of the signals. A matched impedance guarantees less loss and less reflection of a signal.

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