Method and apparatus for reducing EMI in a computer system
    62.
    发明授权
    Method and apparatus for reducing EMI in a computer system 有权
    用于在计算机系统中降低EMI的方法和装置

    公开(公告)号:US06219255B1

    公开(公告)日:2001-04-17

    申请号:US09137472

    申请日:1998-08-20

    Applicant: Abeye Teshome

    Inventor: Abeye Teshome

    Abstract: A computer system includes a microprocessor, an an input coupled to provide signal inputs to the microprocessor, a mass storage coupled to the microprocessor, a video controller for coupling the microprocessor to a display, a memory coupled to provide storage to facilitate execution of computer programs by the microprocessor, and a multilayer printed circuit board for mounting the microprocessor thereon. The multilayer printed circuit board provides for reduced electromagnetic interference (EMI) and includes at least two layers. The multilayer printed circuit board further includes a first conductive segment on a first layer, a second conductive segment on the first layer, the second segment being separated from the first segment by a primary gap, and a conductive interconnect on a second layer, the interconnect for carrying a high frequency signal therein. The second layer is disposed laterally from and substantially parallel to the first layer. The interconnect is further disposed for crossing over the first segment to the second segment in a cross-over region and wherein the first segment and the second segment are further characterized by a secondary gap in the cross-over region, the secondary gap being less than the primary gap for providing an increased coupling in the cross-over region. A method for reducing a source of EMI in a multilayer printed circuit board is also disclosed.

    Abstract translation: 计算机系统包括微处理器,耦合以向微处理器提供信号输入的输入,耦合到微处理器的大容量存储器,用于将微处理器耦合到显示器的视频控制器,耦合以提供存储以便于执行计算机程序的存储器 以及用于在其上安装微处理器的多层印刷电路板。 多层印刷电路板提供降低的电磁干扰(EMI)并且包括至少两层。 所述多层印刷电路板还包括第一层上的第一导电段,所述第一层上的第二导电区段,所述第二区段通过初级间隙与所述第一区段分离,以及在第二层上的导电互连,所述互连 用于在其中携带高频信号。 第二层从第一层横向设置并基本平行于第一层。 所述互连被进一步布置成用于在交叉区域中跨越所述第一段到所述第二段,并且其中所述第一段和所述第二段的进一步特征在于所述交叉区域中的次级间隙,所述次级间隙小于 用于在交叉区域中提供增加的耦合的主要间隙。 还公开了一种用于减少多层印刷电路板中的EMI源的方法。

    Printed circuit board with noise suppression
    63.
    发明授权
    Printed circuit board with noise suppression 失效
    带噪声抑制的印刷电路板

    公开(公告)号:US06215076B1

    公开(公告)日:2001-04-10

    申请号:US08824798

    申请日:1997-03-26

    Abstract: Noise frequency generated from a circuit is determined. The distance between two arbitrary lines of a plurality of power feed lines or a plurality of power return lines extending parallel to each other is determined on the basis of the determined noise frequency in question. The distance between jumper lines for bridging the two arbitrary lines is determined on the basis of the noise frequency, thereby suppressing emitted noise which can be generated on a printed circuit board.

    Abstract translation: 确定从电路产生的噪声频率。 基于所确定的噪声频率来确定多个馈电线的两条任意线之间的距离或者彼此平行延伸的多条功率返回线之间的距离。 基于噪声频率确定用于桥接两条任意行的跨接线之间的距离,从而抑制可能在印刷电路板上产生的发射噪声。

    Method and apparatus for clock uncertainty minimization

    公开(公告)号:US6157251A

    公开(公告)日:2000-12-05

    申请号:US439918

    申请日:1999-11-12

    Abstract: A method and apparatus for drastically reducing timing uncertainties in clocked digital circuits simply, at virtually no cost, and using only standard clock drivers and simple, inexpensive electrical components is described. The method includes the steps of minimizing timing uncertainties by controlling both clock skew and clock jitter. Intrinsic clock skew is eliminated by ganging the outputs of a multi-line clock together onto a capacitive metal island disposed on a printed circuit board (PCB). Extrinsic clock skew is controlled through the use of wide, relatively high-capacitance traces of matched length and disposed on a single, common signal layer of the PCB, each leading to a respective receiver circuit and terminated identically. Clock jitter is controlled by electrically isolating a region of the PCB, disposing the clock driver in the region in such a way as to minimize noise, and providing quiet local power and ground to the region.

    ELECTRONIC CONTROL DEVICE AND GROUND LINE ROUTING METHOD

    公开(公告)号:US20240074034A1

    公开(公告)日:2024-02-29

    申请号:US18261250

    申请日:2021-11-29

    CPC classification number: H05K1/0218 H05K1/14 H05K2201/09345

    Abstract: An electronic control device includes a plurality of circuit boards that transmit signals to each other and a power supply connector for direct-current power. A ground line connected to a ground terminal of the power supply connector is connected to a ground of one of the plurality of circuit boards by way of a ground of another one of the plurality of circuit boards. In this way, the electronic control device including the plurality of circuit boards needs fewer noise reduction components while enabling easier routing of ground lines.

    PRINTED CIRCUIT BOARD AND CARD READER
    68.
    发明申请

    公开(公告)号:US20170132436A1

    公开(公告)日:2017-05-11

    申请号:US15304232

    申请日:2015-04-09

    Abstract: Provided is a printed circuit board having a breakdown detection pattern formed thereon for preventing illicit acquisition of sensitive data, the printed circuit board being configured so that false detection of a disconnection or a short in the breakdown detection pattern can be prevented. The printed circuit board (7) comprises a breakdown detection pattern layer (32) wherein a breakdown detection pattern is formed for detecting a disconnection and/or a shorting thereof, a first pattern layer (31) disposed more to a Y1 direction side than the breakdown detection pattern layer (32), a second pattern layer (33) disposed more to a Y2 direction side than the breakdown detection pattern layer (32), and signal pattern layers (34 to 36) disposed more to the Y2 direction side than the second pattern layer (33). Formed in the first pattern layer (31) are a grounding pattern and a power source pattern covering the breakdown detection pattern from the Y1 direction side. Formed in the second pattern layer (33) are a grounding pattern and a power source pattern covering the breakdown detection pattern from the Y2 direction side.

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