公开(公告)号：US06515868B1

公开(公告)日：2003-02-04

申请号：US09688047

申请日：2000-10-12

申请人： Hideki Sasaki ,  Shuichi Oe ,  Shunji Sato ,  Takahiko Kikukawa ,  Hideaki Kobayashi ,  Takashi Harada ,  Yuki Takahashi

发明人： Hideki Sasaki ,  Shuichi Oe ,  Shunji Sato ,  Takahiko Kikukawa ,  Hideaki Kobayashi ,  Takashi Harada ,  Yuki Takahashi

IPC分类号： H05K702

CPC分类号： H05K1/0231 ,  H05K1/165 ,  H05K2201/09263 ,  H05K2201/09309 ,  H05K2201/0949 ,  H05K2201/10522 ,  H05K2201/10689

摘要： Printed circuit board 1 on which LSI2 is mounted comprises first capacitors 4a and 4b for electrically connecting power source terminals 3a and 3b to via holes 8b, first power source wiring 5a, second power source wiring 6a and a second capacitor 7a. In a predetermined frequency range, the characteristic impedances in power source wirings 5a and 6a are set to three times or more higher than the impedances in capacitors 4a, 4b and 7a. In addition, the lengths of power source wirings 5a and 6a are set to equal to or larger than a value obtained by multiplying 20 mm by the wavelength reduction rate of the printed circuit board and equal to or smaller than a value obtained by multiplying one quarter the wavelength at the upper limit frequency in the predetermined frequency range by the wavelength reduction rate.

摘要翻译： 安装有LSI2的印刷电路板1包括用于将电源端子3a和3b电连接到通孔8b，第一电源布线5a，第二电源布线6a和第二电容器7a的第一电容器4a和4b。 在规定的频率范围内，电源配线5a，6a的特性阻抗为电容器4a，4b，7a的阻抗的3倍以上。 此外，电源配线5a，6a的长度设定为等于或大于通过将20mm乘以印刷电路板的波长缩短率而获得的值等于或小于通过乘以四分之一获得的值 在预定频率范围内的上限频率处的波长为波长缩短率。