A Highly Linear Fully Integrated Powerline Filter for Biopotential Acquisition Systems

作者：Alzaher Hussain A^*; Tasadduq Noman; Mahnashi Yaqub

来源：IEEE Transactions on Biomedical Circuits and Systems, 2013, 7(5): 703-712.

DOI：10.1109/TBCAS.2013.2245506

• Active-RC filters
• biopotential acquisition systems
• powerline interference
• ultra-low frequency filters

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.

• 出版日期2013-10
• 单位中国石油大学（北京）