A Reconfigurable Bandpass Filter with Ferroelectric Devices for Intracardiac Electrograms Monitoring

This paper introduces a novel three-stage bandpass filter for intracardiac electrograms monitoring (IEGM), employing ferroelectric field-effect-transistor (FeFET) technology to allow bandwidth adaptation for personalized medicine. By utilizing FeFET's channel and gate stack as programmable resistor and capacitor respectively, the filter achieves precise cardiac signal isolation tailored to individual's physiological needs. Based on Globalfoundries (GF) 28 nm SLPe process that features FeFET, the design offers a broad continuous gain tuning range (22 dB to 82 dB) and bandwidth tuning range (0.1 to 25 Hz for low cut-off frequency and 10 to 120 Hz for high cut-off frequency), with an average power consumption of 393 nW, showcasing a significant stride in low-power cardiac monitoring. Moreover, input sensitivity to FeFET threshold voltage mismatch and noise characteristics are also evaluated.