DC offsets in direct conversion multistandard wireless receivers: Modeling and cancellation

Authors:
Seok-Bae Park;Mohammed Ismail
Affiliations:
Analog VLSI Laboratory, Department of Electrical and Computer Engineering, Ohio State University, Columbus, USA and Firstpass Technologies, Dublin, USA 43017;Analog VLSI Laboratory, Department of Electrical and Computer Engineering, Ohio State University, Columbus, USA and Firstpass Technologies, Dublin, USA 43017
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2006

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Abstract

To realize a high performance direct conversion receiver for multistandard wireless communications, the limiting factors in the direct conversion receiver should be identified and removed. In this paper, among many problems in direct conversion receivers, the DC offset problem is studied. The origins of the DC offset are summarized, and three self-mixing mechanisms generating the DC offset are modeled to better understand how the static (or time-invariant) and dynamic (or time-varying) DC offsets are produced from the mechanisms. A DC offset cancellation scheme consisting of a static DC offset canceller and a dynamic DC offset canceller is proposed and verified through simulations.