Σ-Δ在数字小数分频器中的应用

The Application of Sigma-Delta Modulator in Digit Fractional Divider

分析了ΣΔ对 S/ N的改善作用 ,将ΣΔ在 A/ D中的应用引入到数字小数分频器中 ,简述了ΣΔ对小数分频器输出相位抖动的改善 ,提出用单级 ΣΔ累加器复用取代多级累加器级联的概念 .

This article analyses the improvement to S/N of Sigma delta. It introduces the application of sigma delta in A/D for digit fractional divider, and describes the improvement to output phase vibration in fractional divider due to the application of sigma delta. The conception of replacing multiple accumulators with repeatedly cycled utilization of a sigma delta accumulator is raised.