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    • 30. 发明专利
    • Printed circuit board
    • 印刷电路板
    • JP2008016470A
    • 2008-01-24
    • JP2006183025
    • 2006-07-03
    • Aica Kogyo Co LtdNec Corpアイカ工業株式会社日本電気株式会社
    • ARAI NOBUHIROTANAKA AKIHIRO
    • H05K1/02H05K1/18
    • H05K1/0234H05K1/0231H05K2201/09236H05K2201/09309H05K2201/10022H05K2201/10159
    • PROBLEM TO BE SOLVED: To achieve stable operation of a high-speed DRAM in a printed circuit board in which the high-speed DRAM and a memory controller are mounted. SOLUTION: In the printed wiring board 1 in which the high-speed DRAM 42 and the memory controller 41 are mounted; a serial connection circuit consisting of a capacitor 45 and a resistor 46 has almost the same resistance value as that of characteristic impedance of a VTT power supply pattern, and is provided between the VTT power supply pattern 20 as a connection destination of a parallel termination resistor 44 of a memory bus wiring 43 and a GND pattern 30. With this configuration, the serial connection circuit can consume a high-frequency noise generated or propagating in the VTT power supply pattern due to an operation between the high-speed DRAM and the memory controller 41. COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:为了在安装有高速DRAM和存储器控制器的印刷电路板中实现高速DRAM的稳定操作。 解决方案:在安装有高速DRAM42和存储器控制器41的印刷电路板1中, 由电容器45和电阻46组成的串联电路具有与VTT电源图案的特性阻抗几乎相同的电阻值,并且设置在作为并联终端电阻的连接目的地的VTT电源图案20之间 44的存储器总线布线43和GND图案30.由于这种配置,串行连接电路可以消耗由于高速DRAM和存储器之间的操作而在VTT电源模式中产生或传播的高频噪声 控制器41.版权所有(C)2008,JPO&INPIT