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14 November 2002 Variable centre frequency bandpass sigma-delta modulator
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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.
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Yingbo Zhu, Said F. Al-Sarawi, and Michael Liebelt "Variable centre frequency bandpass sigma-delta modulator", Proc. SPIE 4935, Smart Structures, Devices, and Systems, (14 November 2002);

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