| 摘要 |
A photoelectric converting semiconductor device includes a photoelectric converting semiconductor element, a coplanar board and a terminal resistance. A distance W between a signal line and a ground line positioned in an area where photoelectric converting semiconductor element is mounted is made wider than the distance in an area where photoelectric converting semiconductor element is not mounted, and width of signal line positioned in the area where photoelectric converting semiconductor element is mounted is made narrower than in the area where photoelectric converting semiconductor element is not mounted. Thus, when the photoelectric converting semiconductor element is mounted on the coplanar board, variation of characteristic impedance is suppressed.
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