Date of Award

8-2008

Level of Access Assigned by Author

Campus-Only Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Electrical and Computer Engineering

Advisor

Donald M. Hummels

Second Committee Member

David E. Kotecki

Third Committee Member

Duane Hanselman

Abstract

Due to consumer demand for wireless devices that support multimedia services ranging from voice and data transfer to video on demand, there is a need for flexible and adaptable base stations. These systems are typically implemented using a wide-band receiver that captures and digitizes the entire cellular band which contains multiple wireless standards. In order to digitize the entire cellular band, there is a requirement for wide bandwidth, high-resolution analog-to-digital converters (ADCs). In general, these ADCs are hard to realize and require some form of calibration to meet the requirements. In this thesis, two novel digital background calibration techniques targeted for pipeline and ??S architecture ADCs are reported. The two calibration schemes are realized by introducing a redundancy in the system. For the pipeline architecture converters, two extra stages located at the end of the pipeline are implemented and are active only during calibration process. This calibration is suitable for implementation in a fully monolithic pipeline ADCs. For the ΠΔΣ architecture converters, an extra channel that is linearly dependent on the ΠΔΣ channels is implemented to correct for channel gain mismatches. All channels are calibrated simultaneously, and calibration of the overall system depends on the convergence rate of a recursive-least-squares algorithm.

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