| 摘要 |
<p>A printed circuit board is provided to suppress the generation of electromagnetic wave more efficiently by differentiating a signal layer and a ground layer according to a switching speed of a signal to process an electronic element. A printed circuit board(10) includes an external ground layer(11), an insulating material(12), a power layer(13), and at least one signal layer(15). The external ground layer is placed at any one layer among two most external layers. The signal layer is placed at the other layer among the two most external layers. The power layer is formed between the signal layer and the external ground layer. An electronic component having a relatively slow clock signal speed among the mounted electronic components is connected to the external ground layer and an electronic component having a relatively rapid clock signal speed is connected to an intermediate ground layer.</p> |
