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A Reconfigurable RF Filter With 1%–40% Fractional Bandwidth for 5G FR1 Receivers

Ghotbi, Iman LU orcid ; Behmanesh, Baktash LU orcid and Törmänen, Markus LU orcid (2023) In IEEE Solid-State Circuits Letters 6. p.97-100
Abstract
This letter presents a radio frequency front-end (RFFE) for 5G new radio (NR) receivers operating in frequency range 1 (FR1). The core of this RFFE is a synthetic fourth-order Q -enhanced RF filter employing gm -boosting, noise-canceling, capacitive cross-coupling, and forward body-biasing techniques to achieve 1.7 to 6.4 GHz operating range and 1% to 40% adjustable fractional bandwidth (FBW). The function of the filter is based on subtracting out-of-phase signals in the passband and in-phase signals in the stopband. Two Q -enhanced LC resonators are utilized for outphasing. The filter is preceded by a low-noise transconductance amplifier, and it is followed by a programmable gain amplifier and a differential buffer stage for the... (More)
This letter presents a radio frequency front-end (RFFE) for 5G new radio (NR) receivers operating in frequency range 1 (FR1). The core of this RFFE is a synthetic fourth-order Q -enhanced RF filter employing gm -boosting, noise-canceling, capacitive cross-coupling, and forward body-biasing techniques to achieve 1.7 to 6.4 GHz operating range and 1% to 40% adjustable fractional bandwidth (FBW). The function of the filter is based on subtracting out-of-phase signals in the passband and in-phase signals in the stopband. Two Q -enhanced LC resonators are utilized for outphasing. The filter is preceded by a low-noise transconductance amplifier, and it is followed by a programmable gain amplifier and a differential buffer stage for the measurement purposes and gain equalization. The experimental results demonstrate that the voltage gain is tunable between 18 and 47 dB with 0.2 dB steps, which leads to an equalized output power in all the filter configurations. Fabricated in 22 nm fully depleted silicon on insulator (FD-SOI) technology, the RFFE achieves 4.6-dB NF, −14 dBm IB-IIP3, and 26-dBm IB-IIP2 at 4 GHz. Notably, the fourth-order steep roll-off provides 22-dBm OOB-IIP3 at 2×BW frequency offset. The entire RFFE draws 22–45 mA from a 1-V supply and the filter core occupies 0.11 mm2 chip area. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
5G new radio (NR), body biasing, filter, fully depleted silicon on insulator (FD-SOI), gm-boosting, noise canceling, Q-enhanced, sub-6-GHz
in
IEEE Solid-State Circuits Letters
volume
6
pages
4 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85153388686
ISSN
2573-9603
DOI
10.1109/LSSC.2023.3265208
language
English
LU publication?
yes
id
d99c9f43-6a43-41d5-b8f0-998fb3356cb9
date added to LUP
2023-04-21 14:38:10
date last changed
2024-06-04 09:26:12
@article{d99c9f43-6a43-41d5-b8f0-998fb3356cb9,
  abstract     = {{This letter presents a radio frequency front-end (RFFE) for 5G new radio (NR) receivers operating in frequency range 1 (FR1). The core of this RFFE is a synthetic fourth-order Q -enhanced RF filter employing gm -boosting, noise-canceling, capacitive cross-coupling, and forward body-biasing techniques to achieve 1.7 to 6.4 GHz operating range and 1% to 40% adjustable fractional bandwidth (FBW). The function of the filter is based on subtracting out-of-phase signals in the passband and in-phase signals in the stopband. Two Q -enhanced LC resonators are utilized for outphasing. The filter is preceded by a low-noise transconductance amplifier, and it is followed by a programmable gain amplifier and a differential buffer stage for the measurement purposes and gain equalization. The experimental results demonstrate that the voltage gain is tunable between 18 and 47 dB with 0.2 dB steps, which leads to an equalized output power in all the filter configurations. Fabricated in 22 nm fully depleted silicon on insulator (FD-SOI) technology, the RFFE achieves 4.6-dB NF, −14 dBm IB-IIP3, and 26-dBm IB-IIP2 at 4 GHz. Notably, the fourth-order steep roll-off provides 22-dBm OOB-IIP3 at 2×BW frequency offset. The entire RFFE draws 22–45 mA from a 1-V supply and the filter core occupies 0.11 mm2 chip area.}},
  author       = {{Ghotbi, Iman and Behmanesh, Baktash and Törmänen, Markus}},
  issn         = {{2573-9603}},
  keywords     = {{5G new radio (NR); body biasing; filter; fully depleted silicon on insulator (FD-SOI); gm-boosting; noise canceling; Q-enhanced; sub-6-GHz}},
  language     = {{eng}},
  month        = {{04}},
  pages        = {{97--100}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Solid-State Circuits Letters}},
  title        = {{A Reconfigurable RF Filter With 1%–40% Fractional Bandwidth for 5G FR1 Receivers}},
  url          = {{http://dx.doi.org/10.1109/LSSC.2023.3265208}},
  doi          = {{10.1109/LSSC.2023.3265208}},
  volume       = {{6}},
  year         = {{2023}},
}