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A new approach in low noise direct digital synthesis based on a fractional-N frequency divider

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2 Author(s)
Robert Storch ; Ruhr Universitaet Bochum, Institute of Electronic Circuit Design, Bochum, Germany ; Thomas Musch

Frequency synthesisers in subsampling systems are often a crucial point. In order to achieve a small frequency offset between two signals a fine frequency resolution is required. Therefore a direct digital synthesiser with a frequency resolution of a few Hz would be fine but these systems suffer from unwanted spurious content resulting in a bad phase noise performance. This paper presents a new approach in direct digital synthesis for signals with small frequency offset based on a fractional-N frequency divider. The basic concept as well as a realization of the system are presented. Measurements of this first prototype show a good spurious and phase noise performance.

Published in:

Microwave Conference (EuMC), 2011 41st European

Date of Conference:

10-13 Oct. 2011