University of Oulu

M. Jokinen, A. Sethi, O. Kursu, T. Rahkonen, M. E. Leinonen and A. Pärssinen, "Iterative Calibration Method for Integrated Tunable mmW Vector-Sum Phase Shifter," 2023 100th ARFTG Microwave Measurement Conference (ARFTG), Las Vegas, NV, USA, 2023, pp. 1-4, doi: 10.1109/ARFTG56062.2023.10148880

Iterative calibration method for integrated tunable mmW vector-sum phase shifter

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Author: Jokinen, Markku1; Sethi, Alok1; Kursu, Olli1;
Organizations: 1Centre for Wireless Communications, University of Oulu, Finland
2Electronics Circuits and Systems Research Unit, University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: IEEE, 2023
Publish Date: 2023-07-06


An iterative calibration method of 5G mmW vector- sum phase shifter (VSPS) is presented in this paper. The phase and amplitude imbalances of I and Q branches can be tuned. The phase is adjusted with a tunable polyphase filter (PPF) by changing its resonance frequency. The VSPS is equipped with differential amplifiers on each branch which are used to compensate for the amplitude imbalance. The iterative calibration method uses information collected during the measurements and adjusts VSPS parameters towards the optimal operation point. The error vector magnitude (EVM) of VSPS phase constellation decreases fast along the iterations, and the calibration process can be finished with a fraction of the measurement time compared with exhaustive search. Results show that the method can reach an RMS amplitude error of 0.11 dB and phase error of 0.6 degrees on selected frequency points.

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ISBN: 978-1-6654-7494-8
ISBN Print: 978-1-6654-7495-5
Pages: 1 - 4
DOI: 10.1109/arftg56062.2023.10148880
Host publication: 2023 100th ARFTG Microwave Measurement Conference (ARFTG)
Conference: ARFTG Microwave Measurement 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, 6G Flagship program under Grant 346208 and Business Finland projects NGmining (44049/31/2020) and RFSampo (3071/31/2021).
Academy of Finland Grant Number: 346208
Detailed Information: 346208 (Academy of Finland Funding decision)
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