Publication detail

31.3 nW, 0.5 V Bulk-Driven OTA for Biosignal Processing

KUMNGERN, M. KULEJ, T. KHATEB, F.

Original Title

31.3 nW, 0.5 V Bulk-Driven OTA for Biosignal Processing

Type

journal article in Web of Science

Language

English

Original Abstract

This paper presents a new extremely low-voltage low-power bulk-driven (BD) operational transconductance amplifier (OTA) realized for low frequency biosignal processing. The CMOS structure of the OTA utilizes bulk-driven and self-cascode techniques in the subthreshold region, supporting the operation with the supply voltage (V-DD) as the threshold voltage (V-TH) of a single MOS transistor, i.e., V-DD = V-TH = 0.5 V, while offering nano power consumption (31.3 nW for 15 nA nominal setting current). Using the extremely low-voltage and low-power OTA in biosignal processing enables extending the lifetime of applications that are powered by battery or energy harvesting sources. The OTA has a 54.7 dB low frequency gain, 6.18 kHz gain bandwidth and 75 degrees phase margin at 15 pF load capacitance. The proposed OTA has been used to realize a bandpass filter (BPF) with adjustable gain for electrocardiogram (ECG) signal processing. The higher cutoff frequency of the BPF is adjustable electronically by a setting current and the BPF's gain can be adjusted by capacitors value. The total harmonic distortion (THD) of the BPF is -53.56 dB, the input integrated input-referred voltage noise is 17.9 mu V-rms, the common mode rejection ratio (CMRR) is 75 dB and the power supply rejection ratio (PSRR) is 87.7 dB. The BPF was designed in the Cadence program using 0.18 mu m CMOS technology from TSMC. The simulation results agree with the presented theory.

Keywords

Operational transconductance amplifier (OTA); bulk-driven; band-pass filter; low-voltage; low-power CMOS

Authors

KUMNGERN, M.; KULEJ, T.; KHATEB, F.

Released

24. 5. 2023

Publisher

IEEE

Location

PISCATAWAY

ISBN

2169-3536

Periodical

IEEE Access

Year of study

11

Number

1

State

United States of America

Pages from

56516

Pages to

56525

Pages count

10

URL

https://ieeexplore.ieee.org/document/10132880

Full text in the Digital Library

http://hdl.handle.net/11012/213551

BibTex

@article{BUT183973,
  author="Montree {Kumngern} and Tomasz {Kulej} and Fabian {Khateb}",
  title="31.3 nW, 0.5 V Bulk-Driven OTA for Biosignal Processing",
  journal="IEEE Access",
  year="2023",
  volume="11",
  number="1",
  pages="56516--56525",
  doi="10.1109/ACCESS.2023.3279727",
  issn="2169-3536",
  url="https://ieeexplore.ieee.org/document/10132880"
}

Documents

31.3 nW, 0.5 V Bulk-Driven OTA for Biosignal Processing.pdf