Printed circuit board silkscreen
PCB are usually printed with a non-conductive permanent epoxy ink. The color is usually white, although other colors are available: yellow, black, blue, red. Screen printing is used to render useful information on the PCB board that can help users during assembly. It is used to mark component pcb values, part numbers,
Properties of the printed circuit board
usually unwanted, circuit elements; rather, they can be used as part of the circuit design, as in distributed element filters, antennas, and fuses, avoiding the pcb need for additional separate components. High Density Interconnect (HDI) PCBs have traces and/or insulation less than 125 micrometers in width
Controlled impedances of printed circuits
pcb 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. The longer the route or the higher the frequency, the better adaptation is