University of Oulu

A. Sethi, R. Akbar, M. Hietanen, T. Rahkonen and A. Pärssinen, "A 26GHz to 34GHz Active Phase Shifter with Tunable Polyphase Filter for 5G Wireless Systems," 2021 16th European Microwave Integrated Circuits Conference (EuMIC), 2022, pp. 301-304, doi: 10.23919/EuMIC50153.2022.9784035.

A 26 GHz to 34 GHz active phase shifter with tunable polyphase filter for 5G wireless systems

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Author: Sethi, Alok1; Akbar, Rehman1; Hietanen, Mikko1;
Organizations: 1University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2023-01-09


This paper presents a vector summing Active Phase Shifter (APS) for 5G and 6G wireless systems. The circuit is fabricated using 45nm CMOS SOI technology and exploits 10bit control to set the desired amplitude and phase. The design uses a high-precision tunable polyphase filter (PPF) whose center frequency can be tuned from 23GHz to 40GHz. By utilizing a tunable PPF and independent gain tuning of the quadrature signals along with a simple calibration, a square phase constellation is achieved over the full operating band, resulting in an easy phase control with a mean resolution of 0.5 degree and 7dB of amplitude control to facilitate amplitude tapering. The measured RMS phase and amplitude errors are as small as 0.6 degree and 0.08dB, respectively. Active area occupied is 0.19 sq. mm, allowing a high degree of integration in a phased array system.

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ISBN: 978-2-87487-064-4
ISBN Print: 978-1-6654-4722-5
Article number: 9784035
DOI: 10.23919/eumic50153.2022.9784035
Host publication: 2021 16th European Microwave Integrated Circuits Conference (EuMIC)
Conference: European Microwave Integrated Circuits Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: Nokia is acknowledged for financing the project, GlobalFoundries for chip processing and Keysight for providing measurement equipment. This work was supported in part by the Academy of Finland 6Genesis Flagship (grant no. 318927).
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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