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US 6,310,502 B1Granted
Broadband phase shifting circuit having two phase shifter branches connected in parallel
AssigneeRohde & Schwarz GmbH & Co. KG
InventorJohann Klier
Life of this patent
Estimating the term…
Abstract
A broadband phase-shifting circuit, in particular for an IQ modulator, has two phase-shifting branches connected in parallel, to the input of which is supplied the input signal of which the phase is to be shifted, and which supply at their outputs output signals of which the phase is shifted over a predetermined angle, in particular of 90°. The phase shifter of one phase-shifting branch is controlled depending on the frequency of the input signal in such a way that the phase angle between the two output signals approximately corresponds to the desired value (coarse control), whereas the phase shifter of the other phase-shifting branch is set to the desired phase angle (fine regulation by a phase detector connected between the outputs of the two phase-shifting branches.
Claims12
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.
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 the phase shifter of the phase shifter branch comprises an RC low-pass element and the phase-shifter of the other phase-shifter branch comprises an RC high-pass element.
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 the phase shifters in the phase shifter branches comprise all-pass filters.
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 the phase shifters of the two phase shifter branches comprise RL elements with variable resistors.
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 the phase shifters of the two phase shifter branches comprise RL elements with variable inductances.
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 the phase shifters of the two phase shifter branches comprise RL elements with variable resistors and variable inductances.
Dependencies are inferred from the claim text.