Low-Voltage OTA-C Filter with an Area- and Power-Efficient OTA for Biosignal Sensor Applications

Shuenn-Yuh Lee, Cheng Pin Wang, Yuan Sun Chu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This paper presents a systematic method for decreasing the amount of transconductors used by an operational transconductance amplifier-capacitor (OTA-C) filter to decrease the power consumption and the active area. An OTA with a local-feedback linearized technique and a transconductance booster is proposed based on the presented method. The proposed OTA combines current division with source degeneration to enhance linearity and implement low transconductance. This topology enables the proposed OTA to drive multiple integration capacitors without an additional output stage. The OTA-based circuit realizes low power consumption by operating under a weak inversion at a supply voltage of 1 V. Thus, a fifth-order ladder-type low-pass Butterworth OTA-C filter is implemented for the acquisition of electrocardiograph signals. The proposed method is validated using a prototype fabricated through a 1P6M 0.18-μm CMOS process. Results show that in ECG signal acquisition, the proposed filter has a signal bandwidth located within 250 Hz, a dynamic range of 61.2 dB, and a power consumption of 41 nW to achieve a figure-of-merit of 5.4 × 10-13. The active area of the filter is 0.24 mm2.

Original languageEnglish
Article number8540907
Pages (from-to)56-67
Number of pages12
JournalIEEE Transactions on Biomedical Circuits and Systems
Volume13
Issue number1
DOIs
Publication statusPublished - 2019 Feb 1

Fingerprint

Operational amplifiers
Electric power utilization
Capacitors
Transconductance
Sensors
Electric potential
Ladders
Electrocardiography
Topology
Feedback
Bandwidth
Networks (circuits)

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Electrical and Electronic Engineering

Cite this

@article{2c147d0fade64e7dabb3ac622e316182,
title = "Low-Voltage OTA-C Filter with an Area- and Power-Efficient OTA for Biosignal Sensor Applications",
abstract = "This paper presents a systematic method for decreasing the amount of transconductors used by an operational transconductance amplifier-capacitor (OTA-C) filter to decrease the power consumption and the active area. An OTA with a local-feedback linearized technique and a transconductance booster is proposed based on the presented method. The proposed OTA combines current division with source degeneration to enhance linearity and implement low transconductance. This topology enables the proposed OTA to drive multiple integration capacitors without an additional output stage. The OTA-based circuit realizes low power consumption by operating under a weak inversion at a supply voltage of 1 V. Thus, a fifth-order ladder-type low-pass Butterworth OTA-C filter is implemented for the acquisition of electrocardiograph signals. The proposed method is validated using a prototype fabricated through a 1P6M 0.18-μm CMOS process. Results show that in ECG signal acquisition, the proposed filter has a signal bandwidth located within 250 Hz, a dynamic range of 61.2 dB, and a power consumption of 41 nW to achieve a figure-of-merit of 5.4 × 10-13. The active area of the filter is 0.24 mm2.",
author = "Shuenn-Yuh Lee and Wang, {Cheng Pin} and Chu, {Yuan Sun}",
year = "2019",
month = "2",
day = "1",
doi = "10.1109/TBCAS.2018.2882521",
language = "English",
volume = "13",
pages = "56--67",
journal = "IEEE Transactions on Biomedical Circuits and Systems",
issn = "1932-4545",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "1",

}

Low-Voltage OTA-C Filter with an Area- and Power-Efficient OTA for Biosignal Sensor Applications. / Lee, Shuenn-Yuh; Wang, Cheng Pin; Chu, Yuan Sun.

In: IEEE Transactions on Biomedical Circuits and Systems, Vol. 13, No. 1, 8540907, 01.02.2019, p. 56-67.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Low-Voltage OTA-C Filter with an Area- and Power-Efficient OTA for Biosignal Sensor Applications

AU - Lee, Shuenn-Yuh

AU - Wang, Cheng Pin

AU - Chu, Yuan Sun

PY - 2019/2/1

Y1 - 2019/2/1

N2 - This paper presents a systematic method for decreasing the amount of transconductors used by an operational transconductance amplifier-capacitor (OTA-C) filter to decrease the power consumption and the active area. An OTA with a local-feedback linearized technique and a transconductance booster is proposed based on the presented method. The proposed OTA combines current division with source degeneration to enhance linearity and implement low transconductance. This topology enables the proposed OTA to drive multiple integration capacitors without an additional output stage. The OTA-based circuit realizes low power consumption by operating under a weak inversion at a supply voltage of 1 V. Thus, a fifth-order ladder-type low-pass Butterworth OTA-C filter is implemented for the acquisition of electrocardiograph signals. The proposed method is validated using a prototype fabricated through a 1P6M 0.18-μm CMOS process. Results show that in ECG signal acquisition, the proposed filter has a signal bandwidth located within 250 Hz, a dynamic range of 61.2 dB, and a power consumption of 41 nW to achieve a figure-of-merit of 5.4 × 10-13. The active area of the filter is 0.24 mm2.

AB - This paper presents a systematic method for decreasing the amount of transconductors used by an operational transconductance amplifier-capacitor (OTA-C) filter to decrease the power consumption and the active area. An OTA with a local-feedback linearized technique and a transconductance booster is proposed based on the presented method. The proposed OTA combines current division with source degeneration to enhance linearity and implement low transconductance. This topology enables the proposed OTA to drive multiple integration capacitors without an additional output stage. The OTA-based circuit realizes low power consumption by operating under a weak inversion at a supply voltage of 1 V. Thus, a fifth-order ladder-type low-pass Butterworth OTA-C filter is implemented for the acquisition of electrocardiograph signals. The proposed method is validated using a prototype fabricated through a 1P6M 0.18-μm CMOS process. Results show that in ECG signal acquisition, the proposed filter has a signal bandwidth located within 250 Hz, a dynamic range of 61.2 dB, and a power consumption of 41 nW to achieve a figure-of-merit of 5.4 × 10-13. The active area of the filter is 0.24 mm2.

UR - http://www.scopus.com/inward/record.url?scp=85057197058&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057197058&partnerID=8YFLogxK

U2 - 10.1109/TBCAS.2018.2882521

DO - 10.1109/TBCAS.2018.2882521

M3 - Article

C2 - 30475730

AN - SCOPUS:85057197058

VL - 13

SP - 56

EP - 67

JO - IEEE Transactions on Biomedical Circuits and Systems

JF - IEEE Transactions on Biomedical Circuits and Systems

SN - 1932-4545

IS - 1

M1 - 8540907

ER -