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Low power analog comb filter for biomedical applications

  • Mixed Signal Letter
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Abstract

An analog topology is proposed to implement a comb filter for removal of power-line interference from various low-amplitude biomedical signals. In this proposed methodology, an n-number of all-pass filters (APFs) and an adder circuit are used to suppress n-number of frequencies. All the APFs as well as the adder circuit are designed using a current conveyor to utilize the various properties of the current-mode circuits. The active and passive components used to design the comb filter include second-generation current conveyor (CCII±), resistor, and capacitor. The circuit is designed for n = 4 to remove the power-line frequency of 50 Hz, and its three odd harmonics such as 150 Hz, 250 Hz, and 350 Hz. A PSPICE simulation is done to verify the performance of the proposed circuit. In simulation, all CCII± are designed using macro model of commercially-available current feedback operational amplifier integrated circuit (IC) AD844 as well as dynamic threshold voltage metal oxide semiconductor technology. The proposed circuit is also implemented also using commercially available IC AD844 on breadboard for n = 3. The output result on digital storage oscilloscope confirm the effectiveness of the proposed comb filter circuit in removing the power line interference i.e. the power-line frequency and its odd harmonics.

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Authors and Affiliations

  1. Indian Institute of Technology (ISM), Dhanbad, Jharkhand, India

    Sajal K. Paul

  2. Department of Electronics and Communication Engineering, MLV Textile and Engineering College, Bhilwara, Rajasthan, 311001, India

    Chandan Kumar Choubey

  3. Department of Electronics and Telecommunication Engineering, Dr. D. Y. Patil School of Engineering, Pune, Maharashtra, 412105, India

    Gaurav Tiwari

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  1. Sajal K. Paul
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  2. Chandan Kumar Choubey
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  3. Gaurav Tiwari
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Correspondence to Sajal K. Paul.

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Paul, S.K., Choubey, C.K. & Tiwari, G. Low power analog comb filter for biomedical applications. Analog Integr Circ Sig Process 97, 371–386 (2018). https://doi.org/10.1007/s10470-018-1329-8

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  • DOI: https://doi.org/10.1007/s10470-018-1329-8

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