A 1-V 416-nW FULLY INTEGRATED SENSOR INTERFACE IC FOR PACEMAKERS

Salim Alahdab, Reza Lotfi, Wouter A. Serdijn

Abstract

An ultra-low-power, low-noise sensor interface IC for pacemakers is presented. The proposed architecture is designed to achieve small chip area and a good trade-off between power consumption and noise figure by using current-mode operation. The IECG signal, from 50 mHz-100 Hz, is first filtered by a bandpass filter. Subsequently, the signal output of the filter is converted into a current by a nonlinear transconductance (Gm) cell. The output of the Gm-cell is digitized by a nonlinear 8-bit 1 kS/s Current-mode Successive Approximation ADC to compensate for the nonlinearity of the Gm-cell. The simulated input-referred noise is 5.48 µVrms, achieving a Noise Efficiency Factor of 3.3, and the simulated power consumption for the overall system is 416 nW while operating from a 1 V supply.

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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