Title :
Intermodulation-borne fractional-N frequency synthesiser spurious components
Author :
Brennan, P.V. ; Radmore, P.M. ; Jiang, D.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK
Abstract :
Fractional-N frequency synthesisers have long been known to suffer from a set of spurious components, often referred to as ´fractional spurs´. The authors propose an intermodulation mechanism that is responsible for the production of these components and present numerical and analytic techniques to predict their distribution. These predictions are validated against a range of simulated and measured results to determine the role of intermodulation in fractional-N frequency synthesisers. Finally, two techniques are suggested to allow at least partial mitigation of this effect.
Keywords :
frequency synthesizers; intermodulation; fractional spurs; fractional-N frequency synthesisers; intermodulation mechanism; spurious components;
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings -
DOI :
10.1049/ip-cds:20040443