Digital controls based on pulse-width modulators are usually characterized by a phase delay due to the analog-to-digital conversion process, the sampling time, shape of the carrier, and the algorithm computation time. Multi-sampling operation is adopted to mitigate such delay. Recently proposed, asymmetrical dual-edge carrier-based digital pulse-width modulators are characterized by zero phase delay when operating in double-sampling. Unfortunately, the operating-point dependence does not allow such modulators to be used effectively in multi-sampling mode. This paper investigates an enhanced multi-sampling architecture where the operating-point dependence is mitigated also providing its transfer function model. The proposed architecture is validated in simulations and experimentally.
