University of Oulu

N. Shabanzadeh, M. Shehab, R. Akbar, A. Pärssinen and T. Rahkonen, "Origins of Intermodulation Distortion in A Pseudo-differential CMOS Beamforming Receiver," 2020 IEEE Nordic Circuits and Systems Conference (NorCAS), Oslo, Norway, 2020, pp. 1-6, doi: 10.1109/NorCAS51424.2020.9265000

Origins of intermodulation distortion in a pseudo-differential CMOS beamforming receiver

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Author: Shabanzadeh, Negar1; Shehab, Mahmoud2; Akbar, Rehman1;
Organizations: 1Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
2Nokia Oyj 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: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2021-02-17


This paper studies the generation mechanisms of nonlinear distortion in the combination of an inverter-based LNTA and a passive mixer. The dominant nonlinearity appears to be the quadratic V gs V ds mixing term in the passive mixer, that first causes low-frequency IM2, and then up-converts it to IM3. It is found that adding a common-mode feedback cancels the IM2 in a pseudo-differential structure, and hence also reduces the IM3 caused by the cascaded second order nonlinearities significantly. The CMFB gain and bandwidth considerations and their effect on the results are also given, and it is concluded that from the linearity point of view, the feedback circuit does not have to be very wideband since the dominant distortion products originate from baseband.

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ISBN: 978-1-7281-9226-0
ISBN Print: 978-1-7281-9227-7
Pages: 1 - 6
Article number: 9265000
DOI: 10.1109/NorCAS51424.2020.9265000
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 project was funded by Finnish Academy project 325928 and Academy of Finland 6Genesis Flagship under Grant 318927.
Academy of Finland Grant Number: 325928
Detailed Information: 325928 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
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