Title :
A Low Voltage Rail-to-Rail OPAMP Design for Biomedical Signal Filtering Applications
Author :
Chow, Hwang-Cherng ; Weng, Pu-Nan
Author_Institution :
Chang Gung Univ., Tao-Yuan
Abstract :
In this paper, a 1 volt rail-to-rail input range amplifier has been proposed. In the amplifier design, the current driven bulk (CDB) technique is adopted to reduce threshold voltages of input devices to eliminate the conventional dead zone problem. The performance results of the proposed 1 volt low power amplifier are input rail-to-rail with gain at 71 dB and CMRR at 100 dB. We use the proposed amplifier to implement a low pass filter for biomedical signal applications. Simulation results for an electrocardiograph (ECG) signal are very satisfactory. The total harmonic distortion of the low pass filter is -30 dB. Besides, the programmable cut-off frequency of the bio-signal low pass filter is provided for use.
Keywords :
biomedical electronics; electrocardiography; low-pass filters; low-power electronics; medical signal processing; operational amplifiers; ECG; biomedical signal filtering applications; current driven bulk technique; electrocardiograph signal; harmonic distortion; low pass filter; low power amplifier; low voltage rail-to-rail OPAMP design; programmable cut-off frequency; voltage 1 V; Electrocardiography; Filtering; Low pass filters; Low voltage; Performance gain; Rail to rail amplifiers; Rail to rail inputs; Signal design; Threshold voltage; Total harmonic distortion; biomedical signal; current driven bulk; filter; low voltage; rail-to-rail;
Conference_Titel :
Electronic Design, Test and Applications, 2008. DELTA 2008. 4th IEEE International Symposium on
Conference_Location :
Hong Kong
Print_ISBN :
978-0-7695-3110-6
DOI :
10.1109/DELTA.2008.68
