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Printed circuit board for improving impedance of signal transmission lines

a technology of impedance improvement and printed circuit board, which is applied in the direction of printed circuit aspects, printed circuit manufacture, high frequency circuit adaptation, etc., can solve the problems of failure to impedance of differential pair b>11/b> may not meet the impedance requirements of ieee 1394, and achieve the effect of increasing the impedance of the signal transmission lin

Inactive Publication Date: 2006-10-26
HON HAI PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] What is needed is a printed circuit board with improved impedance of signal transmission lines.

Problems solved by technology

To make computers that can fully take advantage of this standard is a challenge.
However, the thinner you make a PCB the less impedance the signal transmission lines have and thus, may fail to meet with the impedance requirements of IEEE 1394.
Therefore, the impedance of the differential pair 11 may not meet with the impedance requirements of IEEE 1394.

Method used

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  • Printed circuit board for improving impedance of signal transmission lines
  • Printed circuit board for improving impedance of signal transmission lines
  • Printed circuit board for improving impedance of signal transmission lines

Examples

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Embodiment Construction

[0012] Referring to FIG. 1, a printed circuit board 20 in accordance with a first preferred embodiment of the present invention includes a first ground layer 23, a second ground layer 24, a signal layer 25, and two media layers 26 and 27 including power layer, signal layer. The first ground layer 23 is below the signal layer 25, and the two media layers 26, 27 are located between the first ground layer 23 and the second ground layer 24. Two spaced differential pairs 21 and 22 are placed on the printed circuit board 20. The differential pair 21 includes a first differential signal line 210 and a second differential signal line 212, and the differential pair 12 includes a first differential signal line 220 and a second differential signal line 222. The differential pair 21 has a same dimension with the differential pair 22. The first ground layer 23 defines chambers 230 and 231 below the differential pairs 21 and 22 respectively. A width of each of the chambers 230 is equal to or more...

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Abstract

A printed circuit board includes a first ground layer and a second ground layer. The second ground layer is below the first ground layer. A signal transmission line is arranged on the printed circuit board. The first ground layer includes a chamber located below the transmission line. Therefore, the signal transmission line takes the second ground layer as a reference ground layer, so impedance of the signal transmission line is increased.

Description

BACKGROUND [0001] 1. Field of the Invention [0002] The present invention relates to a printed circuit board, and more particularly to a printed circuit board which can improve impedance of signal transmission lines. [0003] 2. General Background [0004] IEEE 1394 is a very fast external bus standard that supports data transfer rates of up to 400 Mbps and 800 Mbps. A single 1394 port can be used to connect up to 63 external devices. To make computers that can fully take advantage of this standard is a challenge. In general, the thinner a printed circuit board (PCB) is, the better the signal transmission capability of signal transmission lines in the printed circuit board is which is needed to improve a computers' use of IEEE 1394. However, the thinner you make a PCB the less impedance the signal transmission lines have and thus, may fail to meet with the impedance requirements of IEEE 1394. [0005] Referring to FIG. 3, a conventional printed circuit board 10 includes a first ground laye...

Claims

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Application Information

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IPC IPC(8): C25D5/02
CPCH05K1/0237H05K1/0245H05K1/0253H05K2201/0969H05K2201/093H05K2201/09309H05K2201/09236
Inventor HSU, SHOU-KUO
Owner HON HAI PRECISION IND CO LTD