Title :
A bio-signal amplifier system with very-large dynamic-range
Author :
Rieger, Robert ; Pan, Yen-Yow
Author_Institution :
Nat. Sun Yat-Sen Univ., Kaohsiung
fDate :
Oct. 30 2007-Nov. 2 2007
Abstract :
The recording of small signals such as body potentials requires high-gain amplification. In a high-gain system even small offset voltages pose a problem when they saturate the amplifier. Especially time-varying offset voltages (e.g. electrode drift) may lead to undesirable blank periods during recording. The system proposed in this work monitors the amplifier output voltage and resets the amplifier before it can leave its dynamic range. The feedback thus provided is not continuous and avoids the shortcomings of conventional filter and feedback approaches. A transistor level implementation of the system is described and simulated results are presented.
Keywords :
amplifiers; medical signal processing; biosignal amplifier system; high-gain amplification; high-gain system; time-varying offset voltages; very-large dynamic-range; Active filters; Cutoff frequency; Dynamic range; Electrocardiography; Electrodes; Feedback; Impedance matching; Information filtering; Information filters; Voltage;
Conference_Titel :
TENCON 2007 - 2007 IEEE Region 10 Conference
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-1272-3
Electronic_ISBN :
978-1-4244-1272-3
DOI :
10.1109/TENCON.2007.4428894
