Printed circuit board construction
PCBs mechanically support electronic components using pads for bonding the component terminals and electrically connect them using traces of one or more layers of copper sheets laminated on and/or between layers of conductive substrate sheets. A printed circuit board can have several layers of copper which are
Properties of the printed circuit board
paths. In a multi-layer board, an internal layer may be mostly solid copper to act as a ground Projection, CAD design plane for shielding and power return. For microwave printed circuits, transmission lines can be laid out in a planar form, such as stripline or microstrip, with dimensions carefully controlled to ensure consistent impedance. In RF and fast
Controlled impedances of printed circuits
CAD design Projection, to determine the track width (w) and insulation thickness (h) of a given impedance. In terms of signal traffic in printed circuits, when the tracks carry signals at high frequencies, great care must be taken in designing the tracks to match the impedance of the upstream and downstream components.