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A Biomedical Sensor Interface With a sinc Filter and Interference Cancellation

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4 Author(s)
Bohorquez, J.L. ; Microsyst. Technol. Labs., Massachusetts Inst. of Technol., Cambridge, MA, USA ; Yip, M. ; Chandrakasan, A.P. ; Dawson, J.L.

A compact, low-power, digitally-assisted sensor interface for biomedical applications is presented. It exploits oversampling and mixed-signal feedback to reduce system area and power, while making the system more robust to interferers. Antialiasing is achieved using a charge-sampling filter with a sinc frequency response and programmable gain. A mixed-signal feedback loop creates a sharp, programmable notch for interference cancellation. A prototype was implemented in a 0.18-μm CMOS process. The on-chip blocks operate from a 1.5-V supply and consume between 255 nW and 2.5 μW depending on noise and bandwidth requirements.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:46 ,  Issue: 4 )