University of Oulu

Y. Shafiullah, R. Akbar, M. Hietanen and A. Pärssinen, "A Voltage Controlled Oscillator with Inductive Divider Design and Analysis at Frequencies Above 100 GHz," 2020 IEEE Nordic Circuits and Systems Conference (NorCAS), Oslo, Norway, 2020, pp. 1-5, doi: 10.1109/NorCAS51424.2020.9265130

A voltage controlled oscillator with inductive divider design and analysis at frequencies above 100 GHz

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Author: Shafiullah, Yasir1; Akbar, Rehman1; Hietanen, Mikko1;
Organizations: 1Centre for Wireless Communications, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.2 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2021-01-14


Millimeter wave oscillators are of particular interest towards future communications and sensing as frequency multiplication of local oscillator signal is resulting in degraded performance. At high frequencies, the quality (Q) factor of the LC tank is degraded. Thus, a higher transconductance (GM) size is required to compensate the losses, thereby consuming high power. Numerous techniques have been adopted to reduce the power consumption of a cross-coupled LC voltage controlled oscillator (VCO) and to improve the negative resistance (Rneg) associated to it. One of them utilizes inductors in the cross-coupled pair. In this paper, we examine the tradeoffs of this inductor to improve negative resistance above 100 GHz. For the analysis, the transistor model is being verified with the simplified small-signal equivalent model. Moreover, we have studied the inductor influence on the transition frequencies of the cross-coupled pair. The restrictions of this technique at high frequencies is investigated. To study the benefits of this technique, an oscillator core is designed and simulated using the 22nm FDSOI CMOS process. It exhibits a tuning range of 5.4% from 125.5 GHz to 132.5 GHz, and phase noise from -101.23 dBc/Hz to -102.0381 dBc/Hz at 10 MHz offset over the entire tuning range. The VCO consumes power of 17 mW. In simulations, an improvement in power consumption by 4.3 mW and phase noise by 1.5 dBc/Hz were achieved when compared to conventional LC Tank VCO.

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ISBN: 978-1-7281-9226-0
ISBN Print: 978-1-7281-9227-7
Pages: 1 - 5
Article number: 9265130
DOI: 10.1109/NorCAS51424.2020.9265130
Host publication: 2020 IEEE Nordic Circuits and Systems Conference (NorCAS)
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: This research has been financially supported by the Academy of Finland 6Genesis Flagship (grant 318927). The authors would like to thank Global Foundries for support and providing PDK.
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