Backplane grounding models for controlling common-mode noise and radiation

Moongilan, Dheena; Palaniswamy, Thangam

doi:10.1109/isemc.1999.812897

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…The differential mode noise radiation in the loop area, formed between live conductors, must be considered; while, for the common mode radiation, the loop area formed between live conductors and the reference (ground) conductor must be considered [5]. In the enclosure to earth ground interconnection conductors, the loop area is formed through the free space similar to a monopole antenna [6,7]. Bare power conductors of opposite polarity and installed on the same surface, depending on their voltage levels, must have a minimum separation distance (NEC 408.56).…”

Section: Noise Currentsmentioning

confidence: 99%

“…The EMC objective for large product enclosures, like a Base Station, requires a hierarchical grounding architecture, as shown in Figure -2. Impedance is gradually reduced [3,6] such that common mode noise is directed to the card cage, chassis or inner wall of the enclosure -but not to the earth ground outside the cabinet, rack or enclosure. However, the lightning and electrostatic currents from the Base Station antenna connection should be made to flow through the outer surfaces of the enclosure to the reference earth ground, through a low impedance path as shown in Figure -1.…”

Section: Hierarchical Grounding Architecture For Emcmentioning

confidence: 99%

“…A typical backplane provides power distribution to circuit packs and interconnection to circuit packs and I/O devices [6]. The outer conductive layer of a backplane is typically known as the frame ground layer.…”

Section: Cabinet and Card Cage Interconnection For Medium And Lamentioning

confidence: 99%

“…In Figure-8, 9 and 9 illustrate grounding interconnections techniques used in backplane layers explained [10,11]. The frame ground layers [6] are provided as outer layers of the backplane. The first layer which is towards the circuit pack side could be either a partially ring or a compete layer as shown in Figure-10.…”

Section: Cabinet and Card Cage Interconnection For Medium And Lamentioning

confidence: 99%

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Grounding architecture design for Wireless Base Stations — EMC and PS considerations

Moongilan¹

2012

2012 IEEE Symposium on Product Compliance Engineering Proceedings

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Grounding facilitates the reduction in the electrical noise from electronic enclosures, improving the operational quality of circuits contained within the enclosures, and satisfying both the Product Safety (PS) and Electromagnetic Compatibility (EMC) requirements. An ideal PS ground of an electronic enclosure should be equipotential (near zero) with respect to the reference ground to minimize the electrical shock potential and to provide a quick drain path for fault currents. However, an EMC ground requires a potential-difference or controlled impedance between interconnected electrical components in order for noise currents to flow from one component to another and eventually should terminate on to a large, non-radiating electrically conductive surface area. To achieve the EMC emissions goal, the noise current flow should be from a smaller to a larger conductive surface area (i.e., higher to lower impedance) through controlled short interconnection ground paths.The interconnections are designed to prevent external electrical noise current from entering into the enclosure and to be as short as possible so that they do not become the radiators, noise couplers, or sources of ground loop oscillations. In this paper several EMC grounding architectures for interconnection of PCBs, backplanes, and card cages to enclosures for Wireless Base Stations are described in the form of signal flow graphs, and their potential for noise radiation and conduction is compared while still achieving the PS grounding compliance requirements.

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Section: Noise Currentsmentioning

confidence: 99%

Section: Hierarchical Grounding Architecture For Emcmentioning

confidence: 99%

Section: Cabinet and Card Cage Interconnection For Medium And Lamentioning

confidence: 99%