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US 6,552,365 B2Granted
Photoelectric converting semiconductor device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorToshiharu Miyahara
Life of this patent
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Abstract
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.
Claims9
A photoelectric converting semiconductor device, comprising:
- a board;
- a signal line formed and extending on said board;
- a ground line formed on said board and extending spaced apart from said signal line;
- a resistance portion formed on said board and electrically connecting said signal line to said ground line;
- and
- a photoelectric converting semiconductor element mounted on said board to cover said signal line and said ground line, electrically connected to said signal line and said ground line and receiving a modulation signal transmitted from a power feed portion for transmitting the modulation signal, to modulate and output a received light;
- wherein
- impedance is substantially the same as impedance of said power feed portion;
- and
- in order to suppress variation of the impedance when said photoelectric converting semiconductor element is mounted on said board, arrangement relation of said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is mounted is made different from arrangement relation between said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is not mounted,
- said signal line and said ground line positioned in the area where said photoelectric converting semiconductor element is not mounted extend spaced by a first distance as said distance;
- and
- said signal line and said ground line positioned in the area where said photoelectric converting semiconductor element is mounted extend spaced by a second distance wider than said first distance
- an additional ground line arranged on a side opposite to the side on which said ground line is positioned along the direction of extension of said signal line, and electrically connected to said ground line;
- wherein
- said photoelectric converting semiconductor element has an electrode portion electrically connecting said ground line to said additional ground line;
- and
- width of said signal line is narrower than said signal line width in a photoelectric converting semiconductor element not having a power feed electrode.
15 more elements
A photoelectric converting semiconductor device, comprising:
- a board;
- a signal line formed and extending on said board;
- a ground line formed on said board and extending spaced apart from said signal line;
- a resistance portion formed on said board and electrically connecting said signal line to said ground line;
- and
- a photoelectric converting semiconductor element mounted on said board to cover said signal line and said ground line, electrically connected to said signal line and said ground line and receiving a modulation signal transmitted from a power feed portion for transmitting the modulation signal, to modulate and output a received light;
- wherein
- impedance is substantially the same as impedance of said power feed portion;
- and
- in order to suppress variation of the impedance when said photoelectric converting semiconductor element is mounted on said board, arrangement relation of said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is mounted is made different from arrangement relation between said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is not mounted
- said signal line and said ground line positioned in the area where said photoelectric converting semiconductor element is not mounted extend spaced by a first distance as said distance;
- and
- said signal line and said ground line positioned in the area where said photoelectric converting semiconductor element is mounted extend spaced by a second distance wider than said first distance;
- said signal line has its width changed steeply from the area where said photoelectric converting semiconductor element is mounted to the area where said photoelectric converting semiconductor element is not mounted, and said photoelectric converting semiconductor element is mounted aligned with a portion where the width changes steeply.
11 more elements
A photoelectric converting semiconductor device, comprising:
- a board;
- a signal line formed and extending on said board;
- a ground line formed on said board and extending spaced apart from said signal line;
- a resistance portion formed on said board and electrically connecting said signal line to said ground line;
- and
- a photoelectric converting semiconductor element mounted on said board to cover said signal line and said ground line, electrically connected to said signal line and said ground line and receiving a modulation signal transmitted from a power feed portion for transmitting the modulation signal, to modulate and output a received light;
- wherein
- impedance is substantially the same as impedance of said power feed portion;
- and
- in order to suppress variation of the impedance when said photoelectric converting semiconductor element is mounted on said board, arrangement relation of said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is mounted is made different from arrangement relation between said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is not mounted
- an additional ground line arranged on a side opposite to the side where said ground line is positioned along the direction of extension of said signal line, and electrically connected to said ground line;
- wherein
- distance between said ground line and said additional ground line positioned in the area where said photoelectric converting semiconductor element is mounted is wider than distance between said ground line and said additional ground line positioned in the area where said photoelectric converting semiconductor element is not mounted.
10 more elements
A photoelectric converting semiconductor device, comprising:
- a board;
- a signal line formed and extending on said board;
- a ground line formed on said board and extending spaced apart from said signal line;
- a resistance portion formed on said board and electrically connecting said signal line to said ground line;
- and
- a photoelectric converting semiconductor element mounted on said board to cover said signal line and said ground line, electrically connected to said signal line and said ground line and receiving a modulation signal transmitted from a power feed portion for transmitting the modulation signal, to modulate and output a received light;
- wherein
- impedance is substantially the same as impedance of said power feed portion;
- and
- in order to suppress variation of the impedance when said photoelectric converting semiconductor element is mounted on said board, arrangement relation of said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is mounted is made different from arrangement relation between said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is not mounted;
- said signal line and said ground line positioned in the region where said photoelectric converting semiconductor element is not mounted are arranged on one same plane;
- and
- said signal line and said ground line positioned in the area where said photoelectric converting semiconductor element is mounted are arranged on mutually different planes substantially parallel to said one same plane.
10 more elements
Dependencies are inferred from the claim text.