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公开(公告)号：US5587920A
公开(公告)日：1996-12-24
申请号：US485703
申请日：1995-06-07
CPC分类号： H05K9/0039 , H05K1/0218 , H05K2201/0715 , H05K2201/093
摘要： In a printed circuit board having a plural number of conductor layers separated by a plural number of insulator layers, a Faraday cage is constructed including a first and a second ground plane disposed in a first and second conductor layer respectively. The ground planes being electrically interconnected at their peripheries, preferably by a plurality of vias. A third conductor layer is disposed between the first and second conductor layers in which a plurality of signal paths are defined. The Faraday cage surrounds a shielded portion of the third conductor layer so that electrical signals conducted through the shielded portion are isolated from electrical noise. The invention finds particular application in a mixed digital/analog board separated into a digital section of the board having a digital ground plane defined in one of the conductor layers and a plurality of digital signal paths defined in another of the conductor layers and an analog section of the board having the Faraday cage and the shielded portion. Thus, the plurality of signal paths in the shielded region are intended for analog signals which are sensitive to digital noise. Additional conductor layers in the analog section can be added inside and outside the Faraday cage. Those analog signal paths located outside the cage are defined for analog signals which are less sensitive than analog signals in the shielded region. The board may be an audio card for a digital computer.
摘要翻译： 在具有由多个绝缘体层隔开的多个导体层的印刷电路板中，构成包括分别设置在第一和第二导体层中的第一和第二接地面的法拉第笼。 地平面在其周边上电连接，优选地通过多个通孔。 第三导体层设置在其中限定多个信号路径的第一和第二导体层之间。 法拉第笼围绕第三导体层的屏蔽部分，使得通过屏蔽部分传导的电信号与电气噪声隔离。 本发明特别适用于分离成板的数字部分的混合数字/模拟板，其具有在导体层中的一个中限定的数字接地层和在另一个导体层中限定的多个数字信号路径和模拟部分 具有法拉第笼和屏蔽部分的板。 因此，屏蔽区域中的多个信号路径用于对数字噪声敏感的模拟信号。 在法拉第笼内可以添加模拟部分中的附加导体层。 位于保持架外部的那些模拟信号路径被定义为比屏蔽区域中的模拟信号更不敏感的模拟信号。 电路板可能是数字计算机的音频卡。
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公开(公告)号：US5475606A
公开(公告)日：1995-12-12
申请号：US26888
申请日：1993-03-05
CPC分类号： H05K9/0039 , H05K1/0218 , H05K2201/0715 , H05K2201/093
摘要： In a printed circuit board having a plural number of conductor layers separated by a plural number of insulator layers, a Faraday cage is constructed including a first and a second ground plane disposed in a first and second conductor layer respectively. The ground planes being electrically interconnected at their peripheries, preferably by a plurality of vias. A third conductor layer is disposed between the first and second conductor layers in which a plurality of signal paths are defined. The Faraday cage surrounds a shielded portion of the third conductor layer so that electrical signals conducted through the shielded portion are isolated from electrical noise. The invention finds particular application in a mixed digital/analog board separated into a digital section of the board having a digital ground plane defined in one of the conductor layers and a plurality of digital signal paths defined in another of the conductor layers and an analog section of the board having the Faraday cage and the shielded portion. Thus, the plurality of signal paths in the shielded region are intended for analog signals which are sensitive to digital noise. Additional conductor layers in the analog section can be added inside and outside the Faraday cage. Those analog signal paths located outside the cage are defined for analog signals which are less sensitive than analog signals in the shielded region. The board may be an audio card for a digital computer.
摘要翻译： 在具有由多个绝缘体层隔开的多个导体层的印刷电路板中，构成包括分别设置在第一和第二导体层中的第一和第二接地面的法拉第笼。 地平面在其周边上电连接，优选地通过多个通孔。 第三导体层设置在其中限定多个信号路径的第一和第二导体层之间。 法拉第笼围绕第三导体层的屏蔽部分，使得通过屏蔽部分传导的电信号与电气噪声隔离。 本发明特别适用于分离成板的数字部分的混合数字/模拟板，其具有在导体层中的一个中限定的数字接地层和在另一个导体层中限定的多个数字信号路径和模拟部分 具有法拉第笼和屏蔽部分的板。 因此，屏蔽区域中的多个信号路径用于对数字噪声敏感的模拟信号。 在法拉第笼内可以添加模拟部分中的附加导体层。 位于保持架外部的那些模拟信号路径被定义为比屏蔽区域中的模拟信号更不敏感的模拟信号。 电路板可能是数字计算机的音频卡。
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公开(公告)号：US5592391A
公开(公告)日：1997-01-07
申请号：US485704
申请日：1995-06-07
CPC分类号： H05K9/0039 , H05K1/0218 , H05K2201/0715 , H05K2201/093
摘要： In a printed circuit board having a plural number of conductor layers separated by a plural number of insulator layers, a Faraday cage is constructed including a first and a second ground plane disposed in a first and second conductor layer respectively. The ground planes being electrically interconnected at their peripheries, preferably by a plurality of vias. A third conductor layer is disposed between the first and second conductor layers in which a plurality of signal paths are defined. The Faraday cage surrounds a shielded portion of the third conductor layer so that electrical signals conducted through the shielded portion are isolated from electrical noise. The invention finds particular application in a mixed digital/analog board separated into a digital section of the board having a digital ground plane defined in one of the conductor layers and a plurality of digital signal paths defined in another of the conductor layers and an analog section of the board having the Faraday cage and the shielded portion. Thus, the plurality of signal paths in the shielded region are intended for analog signals which are sensitive to digital noise. Additional conductor layers in the analog section can be added inside and outside the Faraday cage. Those analog signal paths located outside the cage are defined for analog signals which are less sensitive than analog signals in the shielded region. The board may be an audio card for a digital computer.
摘要翻译： 在具有由多个绝缘体层隔开的多个导体层的印刷电路板中，构成包括分别设置在第一和第二导体层中的第一和第二接地面的法拉第笼。 地平面在其周边上电连接，优选地通过多个通孔。 第三导体层设置在其中限定多个信号路径的第一和第二导体层之间。 法拉第笼围绕第三导体层的屏蔽部分，使得通过屏蔽部分传导的电信号与电气噪声隔离。 本发明特别适用于分离成板的数字部分的混合数字/模拟板，其具有在导体层中的一个中限定的数字接地层和在另一个导体层中限定的多个数字信号路径和模拟部分 具有法拉第笼和屏蔽部分的板。 因此，屏蔽区域中的多个信号路径用于对数字噪声敏感的模拟信号。 在法拉第笼内可以添加模拟部分中的附加导体层。 位于保持架外部的那些模拟信号路径被定义为比屏蔽区域中的模拟信号更不敏感的模拟信号。 电路板可能是数字计算机的音频卡。
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