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

Sethi, Alok; Akbar, Rehman; Aikio, Janne P.; Shaheen, Rana A.; Pärssinen, Aarno; Rahkonen, Timo (2019-11-21)
 
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https://doi.org/10.1109/NORCHIP.2019.8906930

Sethi, Alok
Akbar, Rehman
Aikio, Janne P.
Shaheen, Rana A.
Pärssinen, Aarno
Rahkonen, Timo
Institute of Electrical and Electronics Engineers
21.11.2019

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

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doi:https://doi.org/10.1109/NORCHIP.2019.8906930
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https://urn.fi/URN:NBN:fi-fe2019120345411
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Abstract

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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