University of Oulu

A. Sethi, R. Akbar, J. P. Aikio, R. A. Shaheen, A. Pärssinen and T. Rahkonen, "Designing at Millimeter-Wave: Lessons from a Triple Coil Variable Transformer," 2019 IEEE Nordic Circuits and Systems Conference (NORCAS): NORCHIP and International Symposium of System-on-Chip (SoC), Helsinki, Finland, 2019, pp. 1-4. doi: 10.1109/NORCHIP.2019.8906930

Designing at millimeter-wave : lessons from a triple coil variable transformer

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Author: Sethi, Alok1; Akbar, Rehman1; Aikio, Janne P.1;
Organizations: 1University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2019
Publish Date: 2019-12-03


This paper presents a triple coil variable transformer that can be used to design RF blocks for millimeterwave 5G transceivers. By employing a third coil with a varying capacitive load in a two coil transformer, simultaneous dual band or a wide-band response can be achieved ranging from 20 GHz to 50 GHz. The idea is validated using simulations and fabricated using 45 nm CMOS SOI technology. In addition, reasons for mismatch between the simulated and measured results are studied. Furthermore, a modified switching configuration is proposed to alleviate the problems with the original design.

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ISBN: 978-1-7281-2769-9
ISBN Print: 978-1-7281-2770-5
Pages: 1 - 4
DOI: 10.1109/NORCHIP.2019.8906930
Host publication: 2019 IEEE Nordic Circuits and Systems Conference (NORCAS): NORCHIP and International Symposium of System-on-Chip (SoC) 29-30 Oct 2019 Helsinki, Finland
Conference: IEEE Nordic Circuits and Systems Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: The research leading to these results has received funding from the Nokia Corporation Ltd. The authors would like to acknowledge GLOBALFOUNDARIES for the silicon processing and technical support. This research has been also in part financially supported by Academy of Finland 6Genesis Flagship (grant 318927) and UniOGS Oulu doctoral school.
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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