| 摘要 |
PROBLEM TO BE SOLVED: To obtain a printed wiring board in which a digital signal processing area and an analog signal processing area on the opposite sides of the board can take an overlapped arrangement and conventional restraints of mounting can be eliminated. SOLUTION: The printed wiring board comprises a GND layer 1 for digital circuit formed on the entire surface of one inner layer of the board, a GND layer 2 for analog circuit formed on the inner layer in an analog signal processing area contiguously to the GND layer for digital circuit, and signal lines 12 for transmitting signals from a digital circuit 11 on a part mounting plane 7 to an analog circuit 9 on the same plane. According to the structure, generation of resonance due to parallel plate mode, radiation noise and electromagnetic coupling between signal lines can be suppressed, the digital signal processing area and the analog signal processing area on the opposite sides of the board can take an overlapped arrangement and restraints of mounting can be eliminated. |
