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395349

Design of an Analog Front-End (AFE) for Photoplethysmography (PPG) Acquisition System

Article

Last updated: 21 Dec 2024

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Tags

Electrical Engineering

Abstract

This project implies a low power photoplethysmography (PPG) sensor circuit. PPG sensors are widely used in modern healthcare products for monitoring cardiovascular information. The PPG Signal can reveal diverse conditions, such as respiratory and cardiac arrest, systemic inflammatory response syndrome, renal insufficiency, cardiac insufficiency, systolic arterial pressure, among others. The low-power Analog Front-End (AFE) of the PPG sensor is designed in 0.18 µm CMOS process. The AFE amplifies the weak photocurrent from the photodiode (PD) and converts it to a strong voltage at the output by the means of Transimpedance Amplifier (TIA). To decrease the power consumption, the circuits are designed in subthreshold region; so, the total biasing current of the AFE is a few microwatts. The TIA core, consisting of a self-biased two-stage Miller OTA, operates with a Bandgap Reference (BGR) to manage supply voltage fluctuations. A voltage-to-current converter with a BGR ensures a stable and accurate current output, minimizing dependence on temperature and supply variations. Pseudo-resistance provides the large resistance needed for high TIA gain while maintaining a small chip area. DC offset, which affects TIA operation and amplification, is addressed. An IDAC controlling circuit is used for DC cancellation, enhancing the amplifier's dynamic range by keeping the AC signal clear at the output.

DOI

10.21608/astj.2024.302774.1005

Keywords

Photoplethysmography (PPG), Transimpedance Amplifier (TIA), Pseudo Resistance (PR)

Authors

First Name

Abdelrahman

Last Name

Fathy

MiddleName

Muhammed

Affiliation

Electronics and Communications Department, Faculty of Engineering, Zagazig University, Egypt

Email

abdufathy111@gmail.com

City

Diarb Negm City, Sharqia Governorate

Orcid

-

First Name

Abdelrauf

Last Name

Mohamed

MiddleName

Medhat

Affiliation

Electronics and Communications Department, Faculty of Engineering, Zagazig University, Egypt

Email

20812019100746@eng.zu.edu.eg

City

Zagazig, Sharqia Governorate

Orcid

-

First Name

Areeg

Last Name

Abdelrahman

MiddleName

Kamal

Affiliation

Electronics and Communications Department, Faculty of Engineering, Zagazig University, Egypt

Email

20812019201786@eng.zu.edu.eg

City

Zagazig, Sharqia Governorate

Orcid

-

First Name

Nevin

Last Name

Mohamed

MiddleName

Sami

Affiliation

Electronics and Communications Department, Faculty of Engineering, Zagazig University, Egypt

Email

20812019200508@eng.zu.edu.eg

City

Mashtoul El-suq, Sharqia Governorate

Orcid

-

First Name

Norhan

Last Name

Saber

MiddleName

Mohamed

Affiliation

Electronics and Communications Department, Faculty of Engineering, Zagazig University, Egypt

Email

20812019201795@eng.zu.edu.eg

City

Belbis, Sharqia Governorate

Orcid

-

First Name

Esraa

Last Name

Mohamed

MiddleName

Ahmed

Affiliation

Electronics and Communications Department, Faculty of Engineering, Zagazig University, Egypt

Email

20812019200506@eng.zu.edu.eg

City

Mashtoul El-suq, Sharqia Governorate

Orcid

-

First Name

Rahma

Last Name

Ebrahim

MiddleName

Mohamed

Affiliation

Electronics and Communications Department, Faculty of Engineering, Zagazig University, Egypt

Email

20812019200626@eng.zu.edu.eg

City

Mansoura, Dakahlia Governorate

Orcid

-

First Name

Asmaa

Last Name

Eid

MiddleName

Mansour

Affiliation

Electronics and Communications Department, Faculty of Engineering, Zagazig University, Egypt

Email

20812019200370@eng.zu.edu.eg

City

Zagazig, Sharqia Governorate

Orcid

-

Volume

1

Article Issue

1

Related Issue

51254

Issue Date

2024-06-01

Receive Date

2024-07-08

Publish Date

2024-12-01

Page Start

1

Page End

22

Online ISSN

3009-7614

Article File

ASTJ_Volume 1_Issue 1_Pages 1-22.pdf

PDF . 1.4MB

Link

https://astj.journals.ekb.eg/article_395349.html

Detail API

https://astj.journals.ekb.eg/service?article_code=395349

Order

1

Type

Original Article

Type Code

3,083

Publication Type

Journal

Publication Title

Advanced Sciences and Technology Journal

Publication Link

https://astj.journals.ekb.eg/

MainTitle

Design of an Analog Front-End (AFE) for Photoplethysmography (PPG) Acquisition System

Details

Type

Article

Created At

21 Dec 2024