Graphene-based EMI shielding for vertical noise coupling reduction in 3D mixed-signal system

2012 IEEE 21st Conference on Electrical Performance of Electronic Packaging and Systems Pub Date : 2012-10-01 DOI:10.1109/EPEPS.2012.6457862

Kiyeong Kim, Kyoungchoul Koo, Seulki Hong, Jonghoon J. Kim, Byung-Ho Cho, Joungho Kim

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引用次数: 5

Abstract

Vertical noise coupling caused by the near-field coupling between the RF/analog IC and logic IC is a severe problem in 3D mixed-signal systems. To reduce the vertical noise coupling, graphene is an appropriate material due to its inherent characteristics such as very low thickness, high flexibility, high mechanical strength, and EMI absorbing characteristic. Especially, the EMI absorbing characteristic is an important property as the shield to prevent the vertical noise coupling, as it reduces the re-coupling of the reflected EMI by the shield into other ICs. We measure the reduction of the vertical noise coupling by the mono-layer graphene shield in the 3D mixed-signal system composed of a low noise amplifier (LNA), an on-chip switching model DC-DC converter, and the mono-layer graphene in the frequency and time domain. Through the measurement results, we observed that the mono-layer graphene can maximally reduce the vertical noise coupling by -17 dB in the frequency domain. Additionally, the vertically coupled noise is reduced by 25% in the time domain measurement.

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三维混合信号系统中基于石墨烯的电磁干扰屏蔽降低垂直噪声耦合

射频/模拟集成电路与逻辑集成电路之间的近场耦合引起的垂直噪声耦合是三维混合信号系统中的一个严重问题。为了减少垂直噪声耦合，石墨烯是一种合适的材料，因为它具有非常低的厚度、高柔韧性、高机械强度和电磁干扰吸收特性。特别是，电磁干扰吸收特性是屏蔽防止垂直噪声耦合的重要特性，因为它减少了反射的电磁干扰通过屏蔽进入其他集成电路的再耦合。在由低噪声放大器(LNA)、片上开关模型DC-DC转换器和单层石墨烯组成的三维混合信号系统中，我们测量了单层石墨烯屏蔽层对垂直噪声耦合的降低。通过测量结果，我们观察到单层石墨烯可以在频域内最大限度地降低-17 dB的垂直噪声耦合。此外，在时域测量中，垂直耦合噪声降低了25%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 IEEE 21st Conference on Electrical Performance of Electronic Packaging and Systems

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