What kind of impedance design can we meet on PCB?
The typical test coupon is a PCB approximately 200 x 30 mm with exactly the same trace construction as the main PCB. It has traces that are designed to be the same width and on the same layer as the controlled traces on the main circuit. This is the best way to assure a good result. The test coupon avoids any additional pads or any changes which can influence the PCB impedance. In cases where the laminate thickness is specified, the manufacturer will adjust the trace width to achieve the value of impedance. This coupon will be tested and checked with appropriate testing equipment.
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