Title :
Low noise amplifier for recording ENG signals in implantable systems
Author :
Sacristán, Jordi ; Osés, Ma Teresa
Author_Institution :
Biomed. Applications Group, CNM-IMB, Bellaterra, Spain
Abstract :
In this paper, a low noise amplifier used to sense ENG signals with amplitudes greater than 1 μVp has been designed and fabricated in 0.7 μm CMOS technology. The electrical characterization and results in acute experiments with rats are presented. The main characteristics are: low noise (5 nVrms/√Hz), high CMRR (>90 dB), programmable gain (77 dB-103 dB), bandpass from 100 Hz to 5 kHz and tolerance to the input offset greater than ±50 mV. In order to implement the low cut-off frequency of the band pass filter, an active resistor of 80 MΩ value has been designed with programmable tuning.
Keywords :
CMOS integrated circuits; application specific integrated circuits; band-pass filters; bioelectric potentials; biomedical electronics; biosensors; circuit tuning; differential amplifiers; electric sensing devices; integrated circuit design; integrated circuit noise; integrated circuit testing; neuromuscular stimulation; resistors; 0.7 micron; 100 Hz to 5 kHz; 77 to 103 dB; 80 Mohm; CMRR; ENG signal recording; ENG signal sensor; band-pass filter; electrical properties; electroneurogram; low noise amplifier; programmable gain; programmable tuning; rats; resistor; Band pass filters; CMOS technology; Cutoff frequency; Gain; Low-noise amplifiers; Noise level; Rats; Resistors; Signal design; Tuning;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328933
