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Design of an ultra low voltage VDBA using bulk driven quasi floating gate techniques for high order biosignal processing

Year: 2026

Type: article

Abstract: This paper presents a high-performance ultra-low-voltage (ULV) voltage differencing buffered amplifier (VDBA) operating from a 0.5-V supply. Consisting of an operational transconductance amplifier (OTA) followed by a voltage follower (VF), the proposed VDBA combines bulk-driven (BD) and bulk-driven quasi-floating-gate (BD-QFG) MOS techniques to overcome threshold-voltage limitations and enhance the performance of subthreshold circuits. Designed in the Cadence Virtuoso environment using the TSMC 65-nm CMOS process, the proposed VDBA consumes only 370 nW and occupies 0.022 mm 2 area. Its applicability is demonstrated through a fifth-order Butterworth low-pass filter for ECG signals, achieving an electronically tunable cutoff frequency from 73.65 to 557.8 Hz, 1.1% THD for a $$\:100{\text{}\text{mV}}_{\text{p-p}}$$ input signal, and a 44 dB dynamic range. Monte Carlo and PVT analyses confirm the robustness of the proposed design, while experimental implementation using the commercially available LM13700 further validates the proposed filtering approach.

Source: Scientific Reports

DOI: 10.1038/s41598-026-78669-x

Authors: Montree Kumngern, Fabian Khateb, Tomasz Kulej, Daniel Arbet

Institutions: King Mongkut's Institute of Technology Ladkrabang, Brno University of Technology, University of Defence, Częstochowa University of Technology, Slovak University of Technology in Bratislava

Language: English

Topic: Analog and Mixed-Signal Circuit Design

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,690

OpenAlex ID: W7225621487

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