Abstract
In the Letter a single-loop higher-order delta-sigma modulator with a new loop topology is presented. The loop-filter is composed of both feedback and feedforward paths. No active summing element is required in the modulator implementation. The modulator has low integrator output swings and a high input dynamic range, resulting in relaxed op-amp requirements even for low-voltage operation. Simulation results of a fourth-order modulator having the proposed loop filter are also given.
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