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A New Mechanism Producing Discrete Spurious Components in Fractional- N Frequency Synthesizers

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4 Author(s)
Brennan, P.V. ; Dept. of Electron. & Electr. Eng., Univ. Coll. London, London ; Hongyu Wang ; Dai Jiang ; Radmore, P.M.

Fractional- frequency synthesizers have long been known to suffer from a set of spurious components, often referred to as fractional spurs, which are usually attributed to the operation of the modulator. This paper proposes a new phenomenon-based on cross-coupling and sampling of the nonharmonically related signals present in such synthesizers-which is capable of producing a family of spurious components of identical form to fractional spurs, with support from a range of analytic, simulated and measured results. A unique experimental arrangement is described, allowing controlled cross-coupling of signals within a synthesizer, which provides convincing experimental validation of this mechanism. Finally, techniques are suggested to allow at least partial mitigation of the effect.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:55 ,  Issue: 5 )