Title :
A 1-V analog CMOS front-end for detecting QRS complexes in a cardiac signal
Author :
Lasanen, Kimmo ; Kostamovaara, Juha
Author_Institution :
Dept. of Electr. & Inf. Eng., Univ. of Oulu, Finland
Abstract :
A low-voltage low-power signal processing chip for electrocardiogram measurements has been designed and manufactured. The circuit includes a continuous time, offset-compensated preamplifier with an amplification of 40 dB, an eighth-order Butterworth switched-opamp switched-capacitor (SO-SC) filter with a passband of 8-30 Hz, a 32-kHz crystal oscillator, an SO-SC postamplifier, and a bias circuit. The whole circuit operates with supply voltages from 1.0 to 1.8 V and the measured average current consumption is only about 3 μA. The circuit is therefore very suitable for portable applications such as heart rate detectors.
Keywords :
Butterworth filters; CMOS analogue integrated circuits; analogue processing circuits; biomedical electronics; crystal oscillators; electrocardiography; low-power electronics; medical signal detection; operational amplifiers; preamplifiers; switched capacitor filters; 1 V; 1 to 1.8 V; 32 kHz; 8 to 30 Hz; Butterworth filters; QRS complex detection; SO-SC postamplifier; analog CMOS front-end; bias circuit; cardiac signal; continuous time offset-compensated preamplifier; crystal oscillator; electrocardiogram measurements; low-voltage low-power signal processing chip; switched-capacitor filters; switched-opamp; Filters; Manufacturing processes; Oscillators; Passband; Preamplifiers; Semiconductor device measurement; Signal design; Signal processing; Switching circuits; Voltage; Heart-rate detector; low-voltage low-power biomedical devices; switched opamps (SO); switched-capacitor (SC) filters;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2005.857872
