| 摘要 |
In order to reduce noise propagating from a digital signal circuit to an analog signal circuit, a multilayer printed circuit board includes a first digital signal circuit formed in a first region of a front surface, a first analog signal circuit formed in a second region of the front surface, a second digital signal circuit formed at a back surface corresponding to the first region, a second analog signal circuit formed at the back surface corresponding to the second region; an analog ground circuit formed between the front surface and the back surface to ground the first analog signal circuit and the second analog signal circuit, and a first digital ground circuit arranged between the first digital signal circuit and the analog ground circuit and a second digital ground circuit arranged between the second digital signal circuit and the analog ground circuit to ground the first digital signal circuit and the second digital signal circuit.
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