Electrical & Computer Engineering, Department of


Date of this Version

Fall 12-2-2011


A THESIS Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfilment of Requirements For the Degree of Master of Science, Major: Electrical Engineering, Under the Supervision of Sina Balkir and Michael Hoffman. Lincoln, Nebraska: December, 2011

Copyright (c) 2011 Markus Both


Ultra-wideband (UWB) technology is a new type of technology for wireless communication that is based on the transmission of low power sub-nanosecond pulses. UWB communication utilizes a large bandwidth that overlaps and is coexistent with other wireless communication standards that can be also considered as narrow-band interferers. Because UWB systems are highly susceptible to narrow-band interferers, there is a demand for interferer suppression. An adaptive filter consisting of a two-element diversity receiver that performs minimum mean square error combining (MMSE) by the LMS algorithm is proposed. Thereby the elements of the LMS algorithm as well as the receiver LNA were implemented in an analog RF integrated circuit using 0.13µm CMOS technology. A former research project in 0.25µm CMOS proved operation of the algorithm and attained 14.5dB interferer suppression for the bandwidth from 800MHz to 970MHz.

In this research project, SpectreRF simulations of the implemented design show an interferer suppression of more than 30 dB for interferer levels of up to -10dBm at an operating frequency range of 1GHz to 3GHz. The total average noise figure, in case of no present interferer becomes 6.2dB.

Adviser: Sina Balkir and Michael Hoffman