发明名称 |
LOW-EMI ELECTRONIC APPARATUS, LOW-EMI CIRCUIT BOARD, AND METHOD OF MANUFACTURING THE LOW-EMI CIRCUIT BOARD |
摘要 |
A low-EMI circuit which realizes a high mounting density by converting the potential fluctuation of a power supply layer with respect to a ground layer which occurs on switching an IC device etc., into Joule's heat in the substrate without using any parts as a countermeasure against the EMI. Its structure, a circuit board using it, and a method of manufacturing the circuit board are also disclosed. Parallel plate lines in which the Q-value of the stray capacitance between solid layers viewed from the power supply layer and ground layer is equivalently reduced and which are matchedly terminated by forming a structure in which a resistor (resistor layer) and another ground layer are provided in addition to the power supply layer and the ground layer on a multilayered circuit board. A closed shield structure is also disclosed. This invention can remarkably suppress unwanted radiation by absorbing the potential fluctuation (resonance) which occurs in a power supply loop by equivalently reducing the Q-value of the stray capacitance, absorbing the standing wave by the parallel plate lines matchedly terminated and, closing and shielding the parallel plate lines. |
申请公布号 |
WO9622008(A1) |
申请公布日期 |
1996.07.18 |
申请号 |
WO1996JP00021 |
申请日期 |
1996.01.10 |
申请人 |
HITACHI, LTD.;AKIBA, YUTAKA;NARIZUKA, YASUNORI;TANEI, HIRAYOSHI;KITAMURA, NAOYA |
发明人 |
AKIBA, YUTAKA;NARIZUKA, YASUNORI;TANEI, HIRAYOSHI;KITAMURA, NAOYA |
分类号 |
H01L23/538;H01L23/552;H01L25/16;H05K1/02;H05K1/09;H05K1/11;H05K1/16;H05K3/40;H05K3/42;H05K3/46;H05K9/00 |
主分类号 |
H01L23/538 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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