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Printed circuit board design is based on the circuit schematic, to achieve the circuit designer needs. Printed circuit board design mainly refers to the layout design, need to consider the layout of external connections. Optimization of internal electronic components. Optimized layout of metal connections and vias. Electromagnetic protection. Heat dissipation and other factors. Excellent layout design can save production costs, achieve good circuit performance and thermal performance. Simple layout design can be done manually, and complex layout designs need to be implemented with computer aided design (CAD).
In high-speed designs, the characteristic impedance of the controllable resistors and lines is one of the most important and common problems. First, look at the definition of the transmission line: the transmission line consists of two conductors with a certain length, one conductor used to send the signal, the other used to receive the signal (remember "loop" to replace the "ground" concept). In a multilayer board, each line is part of th |
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