Title :
A low-voltage low-noise CMOS instrumentation amplifier for portable medical monitoring systems
Author :
Wu, Honglei ; Xu, Yong-Ping
Author_Institution :
Dept. of Electr. & Comput. Eng., Singapore Nat. Univ., Singapore
Abstract :
This paper presents a low voltage low noise CMOS instrumentation amplifier (IA) suitable for portable health monitoring devices such as electrocardiogram (ECG) and electroencephalogram (EEG). Based on a current-mode topology, the IA is able to operate under a 1-V supply and consumes 50 μW while providing a voltage gain of 150. An optimum trade-off between noise and voltage headroom is obtained by choosing appropriate operating points and sizes of transistors. The measured input referred noise integrated from 0.4Hz to 200Hz is 1.27 μVrms. The current-mode DC rejection circuit can suppress up to ±11 mV of input DC pedestal caused by medical electrodes, as well as the DC offset of the IA. The IA is fabricated in a standard 0.35μm CMOS technology with a core chip area of 0.7mm2.
Keywords :
CMOS analogue integrated circuits; biomedical electronics; biomedical equipment; current-mode circuits; instrumentation amplifiers; integrated circuit design; low-power electronics; patient monitoring; portable instruments; 0.35 micron; 0.4 to 200 Hz; 1 V; 1.27 muV; 50 muW; CMOS instrumentation amplifier; CMOS technology; DC rejection circuit; current mode topology; electrocardiogram; electroencephalogram; health monitoring devices; medical electrodes; portable medical monitoring systems; Biomedical monitoring; CMOS technology; Electrocardiography; Electroencephalography; Instruments; Integrated circuit measurements; Low voltage; Low-noise amplifiers; Noise measurement; Topology;
Conference_Titel :
IEEE-NEWCAS Conference, 2005. The 3rd International
Print_ISBN :
0-7803-8934-4
DOI :
10.1109/NEWCAS.2005.1496659
