A highly linear fully integrated powerline filter for biopotential acquisition systems.
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.
Hussain A
HA
Alzaher
Noman
N
Tasadduq
Yaqub
Y
Mahnashi
D000669:Amplifiers, Electronic; D020811:Biomedical Technology / Q000295:instrumentation*; D004867:Equipment Design / Q000295:instrumentation*