Fractional-order filter design for ultra-low frequency applications

M. R. Dar, N. A. Kant, F. A. Khanday, C. Psychalinos
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引用次数: 11

Abstract

The paper presents a novel scheme to implement fractional-order filters for ultra-low frequency applications. The scheme is based on the intrinsic property of the fractional-order filters that the pole frequency can be scaled down to sub-hertz by employing the order if the normal pole frequency of the filter is designed slightly less than one. This is in contrast to the scaling techniques employed in low-frequency integer-order filters where the impedance is scaled to decrease the overall capacitance required for low-frequency design. The functioning of the scheme has been demonstrated by an OTA-based low-pass filter example implemented with 0.35μm technology node at ± 1.2V supply voltage.
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分数阶滤波器设计,用于超低频率应用
本文提出了一种用于超低频应用的分数阶滤波器的新方案。该方案是基于分数阶滤波器的固有特性,即如果设计的滤波器的正极频率略小于1,则利用该阶可以将极频率降至亚赫兹。这与低频整阶滤波器中采用的缩放技术形成对比,在低频滤波器中,阻抗被缩放以降低低频设计所需的总电容。在±1.2V电源电压下,采用0.35μm技术节点实现了一个基于ota的低通滤波器实例,验证了该方案的有效性。
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