Single-loop delta-sigma modulator with swing suppression

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