Title: Frequency conversion circuit arrangement and mobile radio comprising said circuit arrangement
Application Number: 03806138 Application Date: 2003.02.17
Publication Number: 1643779 Publication Date: 2005.07.20
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03D7/00;H03C3/40
Applicant(s) Name: Infineon Technologies AG Address:
Inventor(s) Name: Grewing Christian;Hanke Andre
Attorney & Agent: cheng tianzheng chen jingjun
Abstract:
    A frequency conversion circuit arrangement is disclosed providing a complex output signal at its output. The circuit comprises two frequency mixers that are driven, on the one hand, by an input signal and, on the other hand, by a feedback signal. In this case, the feedback signal is the frequency-divided output signal and has been broken down into an in-phase component and a quadrature component. The frequency conversion circuit provides a signal at an output frequency in a manner independent of production tolerances and accurately in terms of frequency, said signal being in the form of an IQ signal and additionally being decoupled, in terms of frequency, from the input signal. The frequency conversion circuit is therefore particularly well suited to use in mobile radio transceivers.
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