Techniques of common-mode (CM) noise absorption have been developed in recent years, but very few of them can achieve CM bidirectional absorption. This article proposed a novel circuit architecture that can provide bidirectional CM noise absorption theoretically, meaning that the circuit can absorb CM noises from both sides of differential channels. The essential concept is to design the even–even and even–odd modes of the proposed circuit individually, and by doing so, the bidirectional absorption can be easily realized in a mathematically sound way. In this article, analytical design equations are derived completely, and synthesis procedure is listed in detail. Then, two bidirectional absorptive CM filters are implemented based on the proposed circuit. One of them is fabricated by the printed circuit board process and the other one is fabricated by the integrated passive device process. These two implementations reveal the flexibility of the proposed circuit. Finally, measured results are given as verification, and a comparison table with previous works is demonstrated.

中文翻译：

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一种新型双向共模噪声吸收电路的电路结构

共模（CM）噪声吸收技术近年来得到了发展，但其中很少有人能够实现共模双向吸收。本文提出了一种新颖的电路架构，理论上可以提供双向共模噪声吸收，这意味着该电路可以吸收来自差分通道两侧的共模噪声。基本概念是单独设计所提出电路的偶-偶和偶-奇模式，通过这样做，可以轻松地以数学上合理的方式实现双向吸收。本文完整地推导出了分析设计方程，并详细列出了合成过程。然后，基于所提出的电路实现了两个双向吸收 CM 滤波器。其中一种采用印刷电路板工艺制造，另一种采用集成无源器件工艺制造。这两种实现方式揭示了所提出电路的灵活性。最后，给出测量结果作为验证，并展示了与前人作品的对比表。