Novel Concept of a Digital SigmaDelta-PLL-Phase-Shift-Modulator

Conference: GeMIC 2008 - German Microwave Conference
03/10/2008 - 03/12/2008 at Hamburg-Harburg, Germany

Proceedings: GeMIC 2008

Pages: 4Language: englishTyp: PDF

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Hillebrand, Juergen (Institute of Parallel and Distributed Systems, Department of Integrated Systems Engineering, University Stuttgart, Universitaetsstrasse 38, 70569 Stuttgart, Germany)
Sadeghfam, Arash; Heuermann, Holger (Department of High Frequency Technologies, Aachen University of Applied Sciences, Eupener Str. 70, 52066 Aachen, Germany)

In this paper, a new concept for a software controlled phase shifter is presented. Hereby, a stable phase shift is realized for the locked loop output signal by digitally controlling the divider patterns of the SigmaDelta-modulator. In combination with a SigmaDelta-vector-signal-generator, it enables the realization of a purely software controlled quadrature amplitude modulation without mixers. Alternatively, it can be implemented in an amplitude independent transmission phase measurements. Furthermore, this concept enables an extremely high resolution of stable phase shifts, resulting in a realiable compact and cost efficient alternative to present hardware concepts with a much higher data rate or an extremely fine measurement resolution.