A 1.8-/spl mu/W sigma-delta modulator for 8-bit digitization of cardiac signals in implantable pacemakers operating down to 1.8 V

Implantable biomedical devices can highly benefit from submicrometer CMOS technologies both in terms of duration-time increase and size shrinking. This work shows how design techniques for submicrometer CMOS technologies lead to improvements in the sensing stage of a cardiac implantable pacemaker. A...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 2005-02, Vol.52 (2), p.71-76
Main Authors: Gerosa, A., Neviani, A.
Format: Article
Language:English
Subjects:
Biomedical measurements
CMOS technology
Delta-sigma modulation
Digital modulation
Heart
Implantable biomedical devices
low power
pacemaker
Pacemakers
Power measurement
Quantization
Sigma delta
Switching circuits
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Summary:Implantable biomedical devices can highly benefit from submicrometer CMOS technologies both in terms of duration-time increase and size shrinking. This work shows how design techniques for submicrometer CMOS technologies lead to improvements in the sensing stage of a cardiac implantable pacemaker. A sigma-delta modulator is presented for 8-bit quantization of the natural electrical activity of the heart, fabricated in a 0.8-/spl mu/m CMOS technology. The low-voltage, low-power design procedure employs switched-opamp and weak inversion CMOS circuits. Measurement results confirm a power dissipation of 1.8 /spl mu/W, a minimum supply voltage of 1.8 V, and more than 50 dB of dynamic range.
ISSN:1549-7747
1057-7130
1558-3791
DOI:10.1109/TCSII.2004.840480