Increasing the time resolution of a pulse width modulator in a class D power amplifier by using delay lines

[摘要] In this paper, we present a method to increase the time resolution of a pulsewidth modulator by using delay lines. The modulator is part of an open loopclass D power amplifier, which uses the ZePoC algorithm to code the audiosignal which is amplified in the class D power stage. If the time resolutionof the pulse width modulator is high enough, ZePoC could also be used tobuild an high accuracy AC power standard, because of its open loop property.With the presented method the time resolution theoretically could beincreased by a factor of 16, which means here the time resolution will beenhanced from 5 ns to 312.5 ps.

[学科分类] 电子、光学、磁材料