A subhertz nanopower low-pass filter

Esther Rodriguez-Villegas, Alexander J. Casson, Phil Corbishley

    Research output: Contribution to journalArticlepeer-review


    This brief presents a first-order low-pass filter topology capable of providing cutoff frequencies down to 2 mHz with power consumption of 5 nW. The circuit is intended for signal conditioning applications, particularly for use with very low frequency physiological signals in low-power portable medical equipment. To achieve a low-frequency cutoff, the filter is based around the use of a clocked transconductor, which provides low transconductance while using a relatively high bias current level. The circuit is implemented in a 0.35- μ technology with a 1-V supply and has 32- μVRMS measured noise and a 64-dB dynamic range. In terms of power consumption and cutoff frequency the reported filter outperforms previous filters from the literature. © 2011 IEEE.
    Original languageEnglish
    Article number5930351
    Pages (from-to)351-355
    Number of pages4
    JournalIEEE Transactions on Circuits and Systems. Part 2: Express Briefs
    Issue number6
    Publication statusPublished - Jun 2011


    • Analog filtering
    • biomedical signal conditioning
    • clocked transconductor
    • low power


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