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
|Author:||Shabanzadeh, Negar1; Shehab, Mahmoud2; Akbar, Rehman1;|
1Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
2Nokia Oyj Oulu, Finland
|Online Access:||PDF Full Text (PDF, 0.7 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe202102175108
Institute of Electrical and Electronics Engineers,
|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.
|Pages:||1 - 6|
2020 IEEE Nordic Circuits and Systems Conference (NorCAS)
IEEE Nordic Circuits and Systems Conference
|Type of Publication:||
A4 Article in conference proceedings
|Field of Science:||
213 Electronic, automation and communications engineering, electronics
This project was funded by Finnish Academy project 325928 and Academy of Finland 6Genesis Flagship under Grant 318927.
|Academy of Finland Grant Number:||
325928 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
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