Patent ID: 6310502
Filing Date: 2001-10-30
Classification: H03H

Abstract:
A broadband phase shifter circuit, comprising:two phase shifter branches connected in parallel to which an input signal to be shifted in phase is supplied at a common input side and which supply at respective outputs phase-shifted output signals shifted by a predetermined angle, wherein, each phase shifter branch comprises a phase shifter, the phase shifter of one phase shifter branch is controlled dependent on the frequency of the input signal such that the phase angle between the phase-shifted two output signals approximately corresponds to a desired value for relatively rough control purposes, the phase shifter of the other phase shifter branch is controlled to the desired phase angle via a phase detector connected between the outputs of the two phase shifter branches for relatively fine control purposes, wherein actuating variables belonging to the respective frequency for the rough control are stored in a memory and are read therefrom dependent upon the frequency of the input signal.