Title :
Measurement and parameter characterization of pseudo-resistor based CCIA for biomedical applications
Author :
Chih-Chan Tu ; Tsung-Hsien Lin
Author_Institution :
Grad. Inst. of Electron. Eng. & Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
This paper performs the detailed analysis and measurement of a pseudo-resistor based CCIA used for bio-potential signal acquisition. The pseudo-resistor is implemented with MOS transistors operating in deep sub-threshold region, whose characteristic is not well-modeled in simulation. The resistor value versus control voltage and the effect of leakage current at OPAMP input node are discussed and characterized in this paper. The tested chip consumes 1.3μA from a 1-V supply, and the total integrated noise from 0.5 to 100 Hz is 3.26μVrms. It achieves a noise efficiency factor of 14.6.
Keywords :
MOSFET; bioelectric potentials; biomedical electronics; biomedical measurement; instrumentation amplifiers; resistors; CCIA; MOS transistors; OPAMP input node; bio-potential signal acquisition; biomedical applications; control voltage; current 1.3 muA; deep sub-threshold region; detailed analysis; frequency 0.5 Hz to 100 Hz; leakage current effect; noise efficiency factor; parameter characterization; pseudo-resistor measurement; resistor value; total integrated noise; voltage 1 V; 1f noise; Frequency measurement; Leakage currents; Mathematical model; Noise measurement; Resistors; CCIA; leakage current; noise; pseudo-resistors;
Conference_Titel :
Bioelectronics and Bioinformatics (ISBB), 2014 IEEE International Symposium on
Conference_Location :
Chung Li
Print_ISBN :
978-1-4799-2769-2
DOI :
10.1109/ISBB.2014.6820938
