Title :
A multi channel chopper modulated neural recording system
Author :
Dagtekin, Mustafa ; Liu, Wentai ; Bashirullah, Rizwan
Author_Institution :
Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA
Abstract :
Presented herein is a fully integrated low-noise CMOS multi-channel amplifier for neural recording applications. The circuit employs the chopper modulation technique to reduce the effect of flicker noise and DC offset. A reduced area design implementation is achieved by trading off the increased noise margin performance of the chopper modulator for minimal amplifier area and analog multiplexing of the recording sites. A fully differential topology is used for the signal path to improve noise immunity. The analog amplifier exhibits 56 dB of gain with a 115 kHz bandwidth and a common mode rejection ratio (CMRR) of 80 dB. Simulation results show a total input referred noise less than 16 nV/√Hz. The system power consumption is approximately 750 μWatts. The fully integrated system was designed in ABN 1.6-μm single poly n-well CMOS process.
Keywords :
CMOS analogue integrated circuits; bioelectric potentials; biomedical electronics; choppers (circuits); differential amplifiers; flicker noise; integrated circuit noise; 115 kHz; 750 muW; CMOS multichannel amplifier; DC offset; analog multiplexing; chopper modulation technique; common mode rejection ratio; flicker noise; fully differential topology; fully integrated low-noise amplifier; minimal amplifier area; neural recording; recording sites; reduced area design implementation; switching noise; top-level architecture; transient simulation; tuning range; 1f noise; CMOS integrated circuits; CMOS process; CMOS technology; Choppers; Filters; Integrated circuit noise; Multiplexing; Neurons; Silicon;
Conference_Titel :
Engineering in Medicine and Biology Society, 2001. Proceedings of the 23rd Annual International Conference of the IEEE
Print_ISBN :
0-7803-7211-5
DOI :
10.1109/IEMBS.2001.1019051
