Patent ID: 8988049
Filing Date: 2015-03-24
Classification: H03F,H03G

Abstract:
1. A DC power stage for providing a power output that tracks a PCM signal input, comprising: a mapping unit for generating an integer number of N digital PWM signals each switched at a same switching frequency by switching states of the N digital PWM signals one at a time based on a level of the PCM signal input; an imbalance correction unit operatively coupled to the mapping unit to adjust a duty ratio of the N digital PWM signals relative to one another based on differentially accumulating errors among the N digital PWM signals to prevent divergence of N digital PWM signals and produce N balanced digital PWM signals; N switches each operatively coupled to a corresponding one of the N digital balanced PWM signals from the imbalance correction unit to switch power from a DC power source based on the corresponding one of N balanced digital PWM signals; N inductances in parallel, each of the N inductances operatively coupled to a corresponding one of the N switches to produce a combined signal; and a low pass filter operatively coupled to filter the combined signal from the N inductors and provide the power output tracking the PCM signal input.