A 20–80 MHz Continuously Tunable Gm-C Low-Pass Filter for Ultra-Low Power WBAN Receiver Front-End

This paper presents a third-order Butterworth low-pass filter (LPF) with continuously tuning capability to be used in the receiver front-end for Wireless Body Area Network (WBAN). To realize the bandwidth tuning for multi-standard operation in WBAN receivers with ultra-low power consumption and mini...

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Autores principales: Xiaoying Wang, Chirn Chye Boon, Kaituo Yang, Lingshan Kong
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Publicado: IEEE 2021
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spelling oai:doaj.org-article:738abbd42c8445739bb098374848fff82021-11-24T00:02:54ZA 20&#x2013;80 MHz Continuously Tunable Gm-C Low-Pass Filter for Ultra-Low Power WBAN Receiver Front-End2169-353610.1109/ACCESS.2021.3128154https://doaj.org/article/738abbd42c8445739bb098374848fff82021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9615069/https://doaj.org/toc/2169-3536This paper presents a third-order Butterworth low-pass filter (LPF) with continuously tuning capability to be used in the receiver front-end for Wireless Body Area Network (WBAN). To realize the bandwidth tuning for multi-standard operation in WBAN receivers with ultra-low power consumption and minimized area, a novel transconductor-capacitor (Gm-C) filter is proposed. The proposed transconductor core uses an additional gain stage with regulated cascode structure to control the transconductance (<inline-formula> <tex-math notation="LaTeX">$G_{m}$ </tex-math></inline-formula>) by tuning the drain-source voltage <inline-formula> <tex-math notation="LaTeX">$V_{ds}$ </tex-math></inline-formula> of the input transistors operating in linear region. Based on fundamental analysis, <inline-formula> <tex-math notation="LaTeX">$V_{ds}$ </tex-math></inline-formula> should be reduced to attenuate the nonlinear effects caused by higher-order harmonic components. This proposed transconductor circuit enables the <inline-formula> <tex-math notation="LaTeX">$G_{m}$ </tex-math></inline-formula> tuning and widens the tuning range while maintaining good linearity with negligible power and area consumption. This work is then implemented into a third-order Butterworth LPF. Measurements show that with external control voltage varying from 450 mV to 550 mV, the cutoff frequency of the LPF can be continuously adjusted from 20 MHz to 80 MHz. This design is implemented in 40 nm CMOS process with 1.1 V supply voltage. The total power consumption of this work is below 2 mW with an active area of 0.0105 mm<sup>2</sup>. Its low power consumption and good area efficiency makes this LPF suitable for WBAN applications.Xiaoying WangChirn Chye BoonKaituo YangLingshan KongIEEEarticleCMOS low-pass filter (LPF)Gm-Cultra-low powerButterworth filterwireless body area network (WBAN)Electrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 154136-154142 (2021)
institution DOAJ
collection DOAJ
language EN
topic CMOS low-pass filter (LPF)
Gm-C
ultra-low power
Butterworth filter
wireless body area network (WBAN)
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
spellingShingle CMOS low-pass filter (LPF)
Gm-C
ultra-low power
Butterworth filter
wireless body area network (WBAN)
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
Xiaoying Wang
Chirn Chye Boon
Kaituo Yang
Lingshan Kong
A 20&#x2013;80 MHz Continuously Tunable Gm-C Low-Pass Filter for Ultra-Low Power WBAN Receiver Front-End
description This paper presents a third-order Butterworth low-pass filter (LPF) with continuously tuning capability to be used in the receiver front-end for Wireless Body Area Network (WBAN). To realize the bandwidth tuning for multi-standard operation in WBAN receivers with ultra-low power consumption and minimized area, a novel transconductor-capacitor (Gm-C) filter is proposed. The proposed transconductor core uses an additional gain stage with regulated cascode structure to control the transconductance (<inline-formula> <tex-math notation="LaTeX">$G_{m}$ </tex-math></inline-formula>) by tuning the drain-source voltage <inline-formula> <tex-math notation="LaTeX">$V_{ds}$ </tex-math></inline-formula> of the input transistors operating in linear region. Based on fundamental analysis, <inline-formula> <tex-math notation="LaTeX">$V_{ds}$ </tex-math></inline-formula> should be reduced to attenuate the nonlinear effects caused by higher-order harmonic components. This proposed transconductor circuit enables the <inline-formula> <tex-math notation="LaTeX">$G_{m}$ </tex-math></inline-formula> tuning and widens the tuning range while maintaining good linearity with negligible power and area consumption. This work is then implemented into a third-order Butterworth LPF. Measurements show that with external control voltage varying from 450 mV to 550 mV, the cutoff frequency of the LPF can be continuously adjusted from 20 MHz to 80 MHz. This design is implemented in 40 nm CMOS process with 1.1 V supply voltage. The total power consumption of this work is below 2 mW with an active area of 0.0105 mm<sup>2</sup>. Its low power consumption and good area efficiency makes this LPF suitable for WBAN applications.
format article
author Xiaoying Wang
Chirn Chye Boon
Kaituo Yang
Lingshan Kong
author_facet Xiaoying Wang
Chirn Chye Boon
Kaituo Yang
Lingshan Kong
author_sort Xiaoying Wang
title A 20&#x2013;80 MHz Continuously Tunable Gm-C Low-Pass Filter for Ultra-Low Power WBAN Receiver Front-End
title_short A 20&#x2013;80 MHz Continuously Tunable Gm-C Low-Pass Filter for Ultra-Low Power WBAN Receiver Front-End
title_full A 20&#x2013;80 MHz Continuously Tunable Gm-C Low-Pass Filter for Ultra-Low Power WBAN Receiver Front-End
title_fullStr A 20&#x2013;80 MHz Continuously Tunable Gm-C Low-Pass Filter for Ultra-Low Power WBAN Receiver Front-End
title_full_unstemmed A 20&#x2013;80 MHz Continuously Tunable Gm-C Low-Pass Filter for Ultra-Low Power WBAN Receiver Front-End
title_sort 20&#x2013;80 mhz continuously tunable gm-c low-pass filter for ultra-low power wban receiver front-end
publisher IEEE
publishDate 2021
url https://doaj.org/article/738abbd42c8445739bb098374848fff8
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