Abstract
The developed device refers to analog low-pass filtering circuits and works as Butterworth-type broadband active RC filter. This filter can be used in devices for the human cardiovascular system diagnostic purposes, providing an opportunity to assess the state of the cardiovascular system. Such approach is based on the analysis of cardiointervalogram spectral power and can be implemented in biofeedback systems that use the current values of this power to generate feedback signals. The filter consists of second-order active bandpass filter blocks, connected together in series. Implemented schematic provides simultaneous tuning of the resonant frequency and the quality factor of the band-pass filter. This feature allowing to adjust the bandwidth while maintaining the center frequency and tuning the center frequency while maintaining the constancy of the band. The selection of bandpass filter tuning mode is made by selecting the appropriate adjustable components.
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