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A 1-V, 6-nW programmable 4th-order bandpass filter for biomedical applications

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Abstract

This paper describes the design and realization of a programmable 4th-order, Gm-C bandpass filter for biomedical applications. The core 2nd-order filter stage is realized by a simple gyrator-C active inductor structure with a single MOSFET as the transconductor element. The capacitive input attenuation technique is used to enhance the linearity of the filter. The proposed filter was designed and simulated with a 1-V power supply voltage with process parameters from a standard 0.18 µm CMOS technology. Post-layout simulation shows that the center frequency of the filter is adjustable from 80 Hz to 6.18 kHz by using a programmable bias current generator. At a nominal center frequency of 945 Hz and the quality factor of 3, the filter exhibits a dynamic range of 57.6 dB and an input-referred noise of 174.2 µV. The filter consumes only 6 nW from a 1-V single power supply voltage and the active area of the overall circuit is 0.088 mm2.

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Notes

  1. Assuming the Gaussian statistical process variation, sigma = 3 means that 99.73 % of variations fall within ±3 standard deviations (SD) of the mean value.

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Acknowledgments

This work is supported by the Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (Grant No. PHD/0263/2553).

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Authors and Affiliations

  1. Faculty of Engineering, King Mongkut’s Institute of Technology, Ladkrabang Chalongkrung Road, Bangkok, 10520, Thailand

    Yuwadee Sundarasaradula & Apinunt Thanachayanont

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  1. Yuwadee Sundarasaradula
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  2. Apinunt Thanachayanont
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Correspondence to Yuwadee Sundarasaradula.

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Sundarasaradula, Y., Thanachayanont, A. A 1-V, 6-nW programmable 4th-order bandpass filter for biomedical applications. Analog Integr Circ Sig Process 89, 89–98 (2016). https://doi.org/10.1007/s10470-016-0792-3

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  • DOI: https://doi.org/10.1007/s10470-016-0792-3

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