| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a connector mounting portion structure on a board which enables adjustment of the characteristic impedance of a connector mounting portion. <P>SOLUTION: A plurality of sets of lands 11, 12, and 13 are disposed on the front surface 1a of the board 1, while a ground layer 2 is disposed on the back surface 1b of the board 1. The lands 11 and 13 serve as signal lands, and are connected to signal wiring patterns 1D+ and 1D-. The land 12 between the lands 11 and 13 serves as a ground land. The lands 11 and 13 are provided with open stubs 21 and 23. The open stub 21 (23) is composed of a via-hole 21a (23a) and an electrode 21b (23b). As a result, a capacitance is formed between the electrode 21b (23b) and the ground layer 2. By changing the length or width of the electrode 21b (23b), therefore, the characteristic impedance of the connector mounting portion is adjusted. <P>COPYRIGHT: (C)2009,JPO&INPIT |
