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A fully analog calibration technique for phase and gain mismatches in image-reject receivers

Nikoofard, A ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.aeue.2015.01.014
  3. Publisher: Elsevier GmbH , 2015
  4. Abstract:
  5. A systematic approach to I/Q mismatch calibration in image-reject receivers is presented in this paper. A new error detection algorithm is proposed, which automatically calibrates for phase and gain mismatches limiting the performance of image-reject receivers. A dual-loop feedback is employed which looks for the minimum phase/gain error using a 2-dimensional analog-based search algorithm and then finds the minimum value for the error. An experimental CMOS prototype RF front-end for cognitive radio applications operating at 400-800 MHz is proposed and simulated in the 0.18 μm CMOS technology, achieving an image rejection ratio (IRR) better than 55-dB in post-layout simulation. The comprehensive mathematical model of this analog algorithm is thoroughly studied in the appendix and the convergence is verified theoretically
  6. Keywords:
  7. Cognitive radio (CR) ; Gain and phase mismatch ; I/Q mismatch calibration ; Low-IF receivers ; Receiver calibration ; Calibration ; CMOS integrated circuits ; Calibration techniques ; Dual-loop feedback ; Error detection algorithms ; Image rejection ratios ; Mismatch calibration ; Post layout simulation
  8. Source: AEU - International Journal of Electronics and Communications ; Volume 69, Issue 5 , May , 2015 , Pages 823-835 ; 14348411 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1434841115000291