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http://dx.doi.org/10.17661/jkiiect.2022.15.2.109

Design of a 60 Hz Band Rejection FilterInsensitive to Component Tolerances  

Cheon, Jimin (School of Electronic Engineering, Kumoh National Institute of Technology)
Publication Information
The Journal of Korea Institute of Information, Electronics, and Communication Technology / v.15, no.2, 2022 , pp. 109-116 More about this Journal
Abstract
In this paper, we propose a band rejection filter (BRF) with a state variable filter (SVF) structure to effectively remove the influence of 60 Hz line frequency noise introduced into the sensor system. The conventional BRF of the SVF structure uses an additional operational amplifier (OPAMP) to add a low pass filter (LPF) output and a high pass filter (HPF) output or an input signal and a band pass filter. Therefore, the notch frequency and the notch depth that determine the signal attenuation of the BRF greatly depend on the tolerance of the resistors used to obtain the sum or difference of the signals. On the other hand, in the proposed BRF, since the BRF output is formed naturally within the SVF structure, there is no need for a combination between each port. The notch frequency of the proposed BRF is 59.99 Hz, and it can be confirmed that it is not affected at all by the tolerance of the resistor through the Monte Carlo simulation results. The notch depth also has an average of -42.54dB and a standard deviation of 0.63dB, confirming that normal operation as a BRF is possible. Also, with the proposed BRF, noise filtering was applied to the electrocardiogram (ECG) signal that interfered with 60 Hz noise, and it was confirmed that the 60 Hz noise was appropriately suppressed.
Keywords
Analog filter; band rejection filter; component tolerance; Monte Carlo simulation; notch filter; opamp; powerline interference; state variable filter;
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