Utilizing Reference Voltage Scaling in ΣΔ ADC with Limited Input Dynamic Range Intended for Continuous Ambulatory Heartbeat Detection. - Pankaj Kumar Jha; Pravanjan Patra; Vishnuvardhan Gundlapalle; Ashudeb Dutta; Amit Acharyya; Sudarshan Vadnala (Circuits Syst. Signal Process., 2026)