NDLI: An 114 Hz–12 MHz digitally controlled low-pass filter for biomedical and wireless applications

Content Provider	IET Digital Library
Author	Elamien, Mohamed B. Mahmoud, Soliman A.
Abstract	This study presents a wide tunable Gm-C low-pass filter for biomedical and wireless applications. The proposed filter was designed using the standard 90 nm complementary metal–oxide–semiconductor technology operating with a balanced supply voltage of 1.2 V. Modified linearisation techniques are used to improve the linearity of the digital programmable operational transconductance amplifiers (DPOTAs) which are used in the filter design. The proposed filter consists of three parallel fourth-order Butterworth sections. Each section is designed and optimised to target a specific band of frequencies. The operation of selecting between the different sections is free of any physical switches. Turning off the unwanted sections is utilised by setting the control bits of the corresponding DPOTAs to zeros. The performance of the proposed filter and DPOTAs is validated through simulation results. The third-order harmonic distortion of the DPOTA remains below −60 dB up to 0.5 V differential input voltage. The simulation results show that the digitally tunable cutoff frequency of the proposed low-pass filter is widely varied in the range of 114 Hz–12 MHz. The proposed filter achieves IIP3 of 28 dBm.
Starting Page	606
Ending Page	614
Page Count	9
ISSN	1751858X
Volume Number	12
e-ISSN	17518598
Issue Number	Issue 5, Sep (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cds/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cds.2017.0410
Journal	IET Circuits, Devices & Systems
Publisher Date	2018-03-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Amplifiers Biomedical Application Butterworth Filter CMOS Analogue Integrated Circuit CMOS Digital Integrated Circuit CMOS Integrated Circuit Complementary Metal-oxide-semiconductor Technology Digital Filter Digital Programmable Operational Transconductance Amplifiers Digitally Controlled Low Pass Filter DPOTA Frequency 114 Hz to 12 MHz Harmonic Distortion Integrated Circuit Design Layout Linearisation Technique Low-pass Filter Modelling And Testing Modified Linearisation Technique Operational Amplifier Parallel Fourth-order Butterworth Section Semiconductor Integrated Circuit Design Size 90 Nm Switch Third-order Harmonic Distortion Tunable Gm-C Low-pass Filter Voltage 1.2 V Wireless Application
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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