| 摘要 |
PROBLEM TO BE SOLVED: To provide a wiring board, capable of reducing parasitic capacitance added to wiring. SOLUTION: A semiconductor region 12F is arranged under a wiring 23 arranged on this wiring board, especially the wiring 23 for deciding the operation speed of a circuit system, such as clock signal wiring CK and bus signal wiring Bus, etc. The semiconductor region 12F is formed by a conductive type which is opposite to that of a semiconductor substrate and is electrically maintained in a floating state. The semiconductor region 12F changes the parasitic capacitance added to the wiring 23 to the serial coupling capacitance of MOS capacitance and a p-n junction capacitance and reduces the parasitic capacitance. |
