| 摘要 |
PROBLEM TO BE SOLVED: To provide a printed circuit board where digital and analog circuits are formed and the quality of a signal transmitted through the signal line, or the like between both the circuits is improved, and to provide a digital/analog hybrid circuit and a shield pattern. SOLUTION: A main signal line is formed between through-holes 14, 15 formed in the digital and analog circuits by an internal layer pattern 16, and a helical return path pattern 17 is provided which includes a plurality of through-holes 18 formed along the longitudinal direction of the internal layer pattern 16. The interval of the through-hole 18 is appropriately selected according to the frequency of a signal flowing in the internal layer pattern 16. COPYRIGHT: (C)2006,JPO&NCIPI |
