IEEE Transactions on Circuits and Systems I Fundamental Theory and Applications · 2005 · 34 citations · 15 references
EngineeringBiomedical EngineeringElectrical EngineeringAnalog ElectronicsBiomedical Signal ProcessingMicroelectronicsAnalog FiltersAnalog Integrated CircuitsBiopotential MeasurementCardiac Signal ProcessingElectrocardiogram AnalysisElectrocardiographyAnalog Front-end CircuitsBias Circuit DesignCmos Analog Circuit DesignCmos Analog Integrated CircuitsElectrocardiography InstrumentationHeart RateLow-power Signal ProcessingQrs Complex Detection
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 /spl mu/A. The circuit is therefore very suitable for portable applications such as heart rate detectors.
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Anantha P. Chandrakasan, R.W. Brodersen · 2015 · 2.2K citations
Engineering, Computer Engineering, Electrical Engineering +17