University of Oulu

R. Akbar, R. A. Shaheen, T. Rahkonen, C. Tze, K. Stadius and A. Parssinen, "A 38.5-to-60.5 GHz LNA with Wideband Combiner Supporting Cartesian Beamforming Architecture," ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference (ESSCIRC), 2021, pp. 199-202, doi: 10.1109/ESSCIRC53450.2021.9567865

A 38.5-to-60.5 GHz LNA with wideband combiner supporting cartesian beamforming architecture

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Author: Akbar, Rehman1; Shaheen, Rana A.1; Rahkonen, Timo2;
Organizations: 1Center for Wireless Communications, University of Oulu, Finland
2Circuits and systems Group, University of Oulu, Finland
3Aalto University , Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2021-11-11


Current millimetre-wave (mmW) 5G NR standard supports multiple bands at 24.5/28/37/39/43/47GHz for communications. To cover several bands of the 5G NR and reaching lower end of unlicensed 60GHz band for 802.11ad, this work presents a wideband phased array front-end with LNA and two VGAs for scalar-only weighting function, and a wideband combining network of each signal weight in mmW domain for beamforming. In this work, two array elements are combined in two cascaded stages for extremely wideband operation. Combined load resonances are distributed and adjusted appropriately in each of the combining stages to achieve a flat response over the band of 38.5–60.5GHz. A single array path achieves rms gain of 8.5–12.5dB, noise figure of 6.2–8.1dB, and IP1dB of -33 to–26dBm. The measurements show ≈ 6dB of array gain when the two phased array elements are combined in phase with +0.6dB to -0.4dB maximum gain error in the mmW VGAs. The prototype is implemented using 28nm CMOS.

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ISBN: 978-1-6654-3752-3
ISBN Print: 978-1-6654-3750-9
Pages: 1 - 4
DOI: 10.1109/ESSCIRC53450.2021.9567865
Host publication: Proceedings of ESSCIRC 2021 - IEEE 47th European Conference on Solid-State Circuits 13-22 Sept 2021
Conference: European Conference on Solid-State Circuits, ESSCIRc
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research has been financially supported by Academy of Finland Ex5GRx (grant 2430226211) and also in part 6Genesis Flagship (grant 318927).
Academy of Finland Grant Number: 2430226211
Detailed Information: 2430226211 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
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