Shabanzadeh, N., Akbar, R., Pärssinen, A. et al. Origins and minimization of intermodulation distortion in a pseudo-differential CMOS beamforming receiver. Analog Integr Circ Sig Process 110, 33–45 (2022). https://doi.org/10.1007/s10470-021-01916-w
Origins and minimization of intermodulation distortion in a pseudo-differential CMOS beamforming receiver
|Author:||Shabanzadeh, Negar1; Akbar, Rehman1; Pärssinen, Aarno1;|
1University of Oulu, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 1.3 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2022021619578
|Publish Date:|| 2022-02-16
This paper studies how nonlinear distortion is generated in the combination of an inverter-based low-noise amplifier and a passive mixer. The dominant nonlinearity appears to be the quadratic Vgs Vds mixing term in the passive mixer that first causes low-frequency IM2 and then upconverts it to IM3. Adding a common-mode feedback (CMFB) cancels the IM2 in a pseudo-differential structure, and hence also reduces the IM3 caused by the cascaded second order nonlinearities significantly. The effect of CMFB gain, bandwidth and linearity were analyzed, 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. Finally, the paper takes a look at the spurious tones rising in the mixing, and how to extend the analysis to include the actual frequency translation effect.
Analog integrated circuits and signal processing
|Pages:||33 - 45|
|Type of Publication:||
A1 Journal article – refereed
|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. Open access funding provided by University of Oulu including Oulu University Hospital.
|Academy of Finland Grant Number:||
325928 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
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