Title :
A 28-μW EEG readout front-end utilizing a current-mode instrumentation amplifier and a source-follower-based LPF
Author :
Zhang, Tan-Tan ; Li, Jin-Tao ; Mak, Pui-In ; Vai, Mang-I ; Mak, Peng-Un ; Wan, Feng ; Martins, R.P.
Author_Institution :
Dept. of Biomed. Eng., Univ. of Macau, Macau, China
Abstract :
A novel low-power EEG readout front-end featuring a current-mode instrumentation amplifier (CMIA) followed by a 4th-order gain-compensated source-follower-based lowpass filter (LPF) is proposed. The CMIA is of current-conveyor topology and is chopper-stabilized to improve the common-mode noise rejection and suppress the dc-offset and 1/f noise. The typical gain-loss problem of source-follower-based LPF is alleviated by adopting a gain-compensation technique. Optimized in 0.35-μm CMOS, the achieved CMRR is >100 dB from 0.01 to 16 Hz, and >90 dB up to 40 Hz. With the chopper stabilization, the noise voltage density is 248 nV√Hz at 0.01 Hz and 197 nV√Hz at 100 Hz. The power consumption is 28 μW at 3 V.
Keywords :
1/f noise; CMOS integrated circuits; amplifiers; biomedical equipment; electroencephalography; low-pass filters; medical signal processing; readout electronics; 1-f noise; 4th-order gain-compensated source-follower-based lowpass filter; EEG readout front-end; common-mode noise rejection; current-conveyor topology; current-mode instrumentation amplifier; dc-offset; frequency 0.01 Hz to 16 Hz; gain-compensation technique; gain-loss problem; noise voltage density; novel low-power EEG readout front-end; optimisation; power 28 muW; power consumption; size 0.35 mum; source-follower-based LPF; voltage 3 V; Choppers; Cutoff frequency; Electroencephalography; Gain; Instruments; Mirrors; Noise;
Conference_Titel :
Microelectronics and Electronics (PrimeAsia), 2010 Asia Pacific Conference on Postgraduate Research in
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-6735-8
Electronic_ISBN :
978-1-4244-6736-5
DOI :
10.1109/PRIMEASIA.2010.5604878
