Substrate noise in mixed signal circuits: two case studies [CMOS]

David G. England
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Abstract

There are many noise sources in integrated circuits that can affect sensitive analog nodes. The role of substrate noise is often glossed over since the designer 'knows' that guard rings and separation of the analog section from digital circuits should take care of the noise. However, with smaller geometries now being the norm, it is increasingly difficult to isolate analog nodes from noise induced on the substrate. Also, package economics have introduced other factors that weigh heavily against the analog designer. This paper explores two cases of noise induced on the substrate affecting operation of analog circuits.
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混合信号电路中的衬底噪声:两个案例研究[CMOS]
集成电路中有许多噪声源会影响敏感的模拟节点。基片噪声的作用经常被掩盖,因为设计者“知道”保护环和从数字电路中分离模拟部分应该照顾噪声。然而,随着现在更小的几何形状成为标准,将模拟节点与基板上引起的噪声隔离开来越来越困难。此外,打包经济还引入了其他一些对模拟设计人员不利的因素。本文探讨了基片上产生的两种影响模拟电路工作的噪声。
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