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frequency and becomes critical for printed circuits operating at frequencies above 200 or 300 Mhz. Impedance calculator software is a Services good starting point to determine the track width (w) and insulation thickness (h) of a given impedance. In terms of signal traffic in printed circuits, when the

for shielding and power return. For microwave printed circuits, transmission lines can be laid out in Services a planar form, such as stripline or microstrip, with dimensions carefully controlled to ensure consistent impedance. In RF and fast switching circuits, the inductance and capacitance of the printed circuit board conductors become significant, usually unwanted, circuit elements;

the printed circuit, called serigraphy or silkscreen for short, is done on the top layer of the PCB and has the role of a reference indicator for the components on the PCB. Graphics and text on a circuit board's PCB are usually printed Services with a non-conductive permanent epoxy