A line a " good" is the key to make the transmission line characteristic impedance is maintained constant throughout the line. In a multilayer board, the lines are each part of a transmission line, as a reference plane adjacent to the second line or loop. First, look at the definition of the transmission line : transmission line consists of two conductors composed of a certain length, a conductor used to send a signal, and the other for receiving signals ( remember " loop " instead of "ground " concept ). ![]() In high-speed design, controlled impedance characteristic impedance circuit board and is one of the most important and widespread problem. Simple layout can be achieved by hand, complex layout needs the computer-aided design (CAD) implementation. Excellent layout can reduce production costs, to achieve good performance of the circuit and thermal performance. Optimize the layout of metal wires and vias. Optimize the layout of the internal electronic components. ![]() ![]() Printed circuit board layout design mainly refers to the need to consider the layout of the external connections. Printed circuit board design is based on the schematics, circuit designers to achieve the required functionality.
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