Abstract—A new design technique of RF subsampling continuous time bandpass sigma delta modulator is presented in this paper. The modulator employs a Bulk Acoustic Wave (BAW) resonator. A robust method to eliminate the anti-resonance frequency of the resonator is detailed. Combining subsampling process with BAW technology offers a promising solution to reduce sampling frequency and power consummation of the ΣΔ modulator with high quality-factor. A fourth-order continuous time subsampling bandpass ΣΔ modulator is studied as an example. The Signal Transfer Function and Noise Transfer Function are compared in this context. Besides, the effects of employing BAW resonator on the output SNR of the modulator is studied. Simulation results show that using an input RF signal of 1.56 GHz, the SNR measured with and without anti-resonance cancellation are equal,respectively, to 52 dB and 36 dB when subsampled the signal with 902.85 MHz.
Index Terms—BAW resonator, RF Subsampling, band Pass Sigma Delta modulator.
The authors are with the Innov’Com Laboratory, Sup’ Com, University of Carthage, Tunis, Tunisia (e-mail: Mohamed.dadi@isimg.rnu.tn, Ridha.bouallegue@supcom.rnu.tn).
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Cite: Mohamed Béchir Dadi and Ridha Bouallegue, "A BAW Resonator Based RF Subsampling Band Pass ΣΔ Modulator,"
International Journal of Computer Theory and Engineering vol. 4, no. 4, pp. 670-673, 2012.
