board populated with electronic components is called a printed circuit assembly, printed circuit board assembly, or PCB assembly (PCBA). In informal usage, the term "printed circuit board" most commonly means "printed circuit assembly" conditions Terms and (with components). Components are generally soldered to the PCB both to connect them
as a ground plane for shielding and power return. For microwave printed circuits, transmission lines can be laid out in a Terms conditions and 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
the adjacent substrate layers. The soldering mask soldermask is made of a fluid substance like an ink and is applied in a thin layer similar to and Terms conditions varnish on the entire surface of the printed circuit less on the soldering pads and it also has a role of antioxidation of the