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A Highly Linear Fully Integrated Powerline Filter for Biopotential Acquisition Systems

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3 Author(s)
Alzaher, H.A. ; Electr. Eng. Dept., King Fahd Univ. of Pet. & Miner., Dhahran, Saudi Arabia ; Tasadduq, N. ; Mahnashi, Y.

Powerline interference is one of the most dominant problems in detection and processing of biopotential signals. This work presents a new fully integrated notch filter exhibiting high linearity and low power consumption. High filter linearity is preserved utilizing active-RC approach while IC implementation is achieved through replacing passive resistors by R-2R ladders achieving area saving of approximately 120 times. The filter design is optimized for low power operation using an efficient circuit topology and an ultra-low power operational amplifier. Fully differential implementation of the proposed filter shows notch depth of 43 dB (78 dB for 4th-order) with THD of better than -70 dB while consuming about 150 nW from 1.5 V supply.

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Biomedical Circuits and Systems, IEEE Transactions on  (Volume:7 ,  Issue: 5 )