A Study of the Approximation Problem for Linear-Phase Constant-Phase-Difference Networks

摘要

The need has arisen in single-sideband system for networks that will give a constant phase difference of 90° over a frequency band of some width. Although this problem has been solved to some extent, the transient response and so-called delay characteristic for such networks are not all that could be desired. To improve these, attention is focused herein on the problem of linear-phase, constant-phase-difference networks.nThe problem considers all-pass networks only. There are three different phase characteristics that are formulated and investigated.