An AC Power-Standard using ZePoC-Coding and feed-forward HF-compensation

Abstract

In this paper, the use of the SB-ZePoC Coding-Scheme for a high precision AC Power-Standard (TET-Watt) is proposed. The use of SB-ZePoC allows a novel approach to binary switched precision-sources, as the switching-rate is low compared to sigma-delta modulation. The structure of the system allows to reference the output amplitude directly to a DC-voltage-reference or switching a binary source directly. To reduce HF-switching noise, a feed-forward compensation-circuit is implemented. This reduces the demands to the passive output-filtering.