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This paper describes an ultra-low-power filtering technique for biomedical applications designated as T-wave sensing in heart-activities detection systems. The topology is based on a source-follower-based Biquad operating in the sub-threshold region. With the intrinsic advantages of simplicity and high linearity of the source-follower, ultra-low-cutoff filtering can be achieved, simultaneously with...
This paper describes a high-dynamic-range 2.4 Hz-to-10 kHz wide-range tunable 5th-order Butterworth lowpass filter for biomedical applications. A differential gm-C topology in conjunction with a subthreshold-biased wide-gm-range OTA realizes efficiently a wide frequency tuning capability. For capacitance savings with consequent silicon area reduction, a merged use of floating real capacitor and grounded...
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