一种提高表面贴装并联电容器滤波器高频性能的简单而经济的方法

J. Bernal, M. Freire, S. Ramiro
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引用次数: 8

摘要

并联电容低通滤波器在高频时的性能受到输入回路(由噪声源和电容器定义)和输出回路(由电容器和负载阻抗产生)之间出现的互感的限制。在这项工作中,我们提出了一个简单的修改并联电容滤波器的布局,允许减少这种互感的损害效应,从而增加由并联电容滤波器在高频提供的衰减。我们证明,与典型的并联电容滤波器配置相比,适当的滤波器设计可以将这种衰减增加到大约10 db。这种技术的优点在于它的简单性,它可以在不增加成本、设计时间或滤波器所需的电路板空间的情况下提高滤波器的性能。所提出的技术是基于在通过并联电容器的电流和信号走线上的电流之间施加互感耦合。在这项工作中,我们提出了一个集总元件等效电路来解释这种效应。此外,还设计、制造和测量了几个滤波器测试板,并确定了最大限度地提高该技术效益的关键设计参数。
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Simple and cost-effective method for improving the high frequency performance of surface-mount shunt capacitors filters
The performance of a shunt capacitor low-pass filter at high frequencies is limited by the mutual inductance appearing between the input loop, defined by the noise source and the capacitor, and the output loop created by the capacitor and the loading impedance. In this work we present a simple modification of the layout of the shunt capacitor filter that allows to decrease the impairing effect of this mutual inductance, thus increasing the attenuation provided by the shunt capacitor filter at high frequencies. We demonstrate that this attenuation can be increased up to approximately 10 dBs with proper filter design when comparing with a typical shunt-capacitor filter configuration. The interest of this technique resides in its simplicity, that allows to improve the filter performance without increasing the cost, the design time or the space required on the board by the filter. The proposed technique is based on forcing a mutual inductance coupling between currents flowing through the shunt capacitor and currents on the signal trace. In this work, we present a lumped-element equivalent circuit that explains the effect. Also, several filter test boards are designed, fabricated and measured, and key design parameters to maximize this technique's benefits are identified.
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