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    • 1. 发明授权
    • Virtual ground return for reduction of radiated emissions
    • 减少辐射发射的虚拟地面回报
    • US07292449B2
    • 2007-11-06
    • US11010553
    • 2004-12-13
    • Paul Kevin HallKeith Bryan HardinBrandon Robert Shields
    • Paul Kevin HallKeith Bryan HardinBrandon Robert Shields
    • H05K1/00
    • H05K1/0231H05K1/0237H05K1/148H05K2201/09236
    • A digital apparatus having a cable comprising a plurality of high-speed and low-speed signal carrying conductors, the conductors carrying the low-speed signals are bypassed to a signal ground with selected values of capacitance so as to become virtual signal ground return conductors for the high-speed signal conductors. The selected values of capacitance have a lower impedance then the characteristic impedance of the conductors in the cable. The cable may be a multi conductor cable, a ribbon cable, a flex cable, a twisted pair cable, etc. In a similar fashion, signal conductors on a printed circuit board, not having a separate ground plane layer, may create virtual signal ground returns from the low-speed signal carrying conductors that are proximate to the high-speed signal carrying conductors for reduction of radiated electromagnetic radio frequency interference.
    • 具有包括多个高速和低速信号承载导体的电缆的数字装置,承载低速信号的导体被旁路到具有所选择的电容值的信号地,以便成为用于 高速信号导体。 电容的选定值具有较低的阻抗,即电缆中导体的特性阻抗。 电缆可以是多导体电缆,带状电缆,柔性电缆,双绞线电缆等。以类似的方式,不具有单独的接地层的印刷电路板上的信号导体可以产生虚拟信号接地 从靠近高速信号承载导体的低速信号承载导体返回,以减少辐射电磁射频干扰。