Zhu, Y.Al-Sarawi, S.Liebelt, M.Harvey, E.Abbott, D.Varadan, V.2007-05-142007-05-142002Smart structures, devices, and systems : 16-18 December 2002, Melbourne, Australia / Erol C. Harvey, Derek Abbott, Vijay K. Varadan (eds.) : pp. 197-2040-8194-4730-70277-786Xhttp://hdl.handle.net/2440/28409© 2003 COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.In wideband surveillance and digital radio systems, there is a need to sweep the centre fequency of the data converter to detect a broadcast i nthe band of interest. Hence there is a need to design data converters with variable centre frequencies. Sigma-Delta modulators with programmable center frequency are chosen for this purpose. In this paper new resonators for a variable centre frequency bandpass Sigma-Delta modulator are presented. The new resonators have a centre frequency that extends from very low frequency up to half the sampling frequency. Simulation results of a fourth order discrete-time bandpass modulator employing the new resonator are presented using MATLAB and SPICE.enConference paper002002254410.1117/12.4696670001814946000232-s2.0-003864053559278Al-Sarawi, S. [0000-0002-3242-8197]Liebelt, M. [0000-0001-6610-2876]