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A new Continuous-Time (CT) sigma-delta modulator (SDM) based on the well-known asynchronous SDM is proposed in this paper. To this end, the flash quantizer and the digital-to-analog converter (DAC) in a multibit (MB) CT-SDM clocked at a rate fmax are replaced by a single-bit (SB) comparator with hysteresis clocked at a higher rate fs and a SB-DAC, respectively. By proper selection of the hysteresis...
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