| US 7,595,546 B2 | ||
| Printed circuit board | ||
| Shoji Matsumoto, Yokohama (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Oct. 11, 2006, as Appl. No. 11/548,431. | ||
| Claims priority of application No. 2005-297408 (JP), filed on Oct. 12, 2005; and application No. 2006-272766 (JP), filed on Oct. 04, 2006. | ||
| Prior Publication US 2007/0195473 A1, Aug. 23, 2007 | ||
| Int. Cl. H01L 23/64 (2006.01); H05K 7/00 (2006.01); H04B 3/28 (2006.01) | ||
| U.S. Cl. 257—664 [361/760; 333/12; 333/32; 333/153; 333/160] | 6 Claims |
| 1. A printed circuit board comprising:
a printed wiring board;
a first semiconductor device and a second semiconductor device which are mounted on the printed wiring board; and
a differential line configured to transmit a differential transmission signal between the first semiconductor device and the
second semiconductor device, the differential line including at least three mismatching points which are provided therein
and separated from one another to provide a line length between each set of adjacent mismatching points,
wherein the line lengths are configured such that a transmission time for the differential transmission signal to travel between
each set of adjacent mismatching points satisfies the following expression:
Td=kUI±0.5×Trf
where Td is the transmission time, UI is a signal period, Trf is rise and fall times of the differential transmission signal,
and k is a positive integer.
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