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A new technique is proposed to dramatically reduce the impact of fractional spurs in sigma-delta (ΣΔ) fractional-N synthesisers. The key innovation is the introduction in the bitstream generation process of carefully-chosen set of components at identical offset frequencies and amplitudes and in anti-phase with the principal fractional spurs. These signals are used to modify the ΣΔ noise shaping, so...
Fractional-N 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 presents the investigation and development of several new, advanced techniques to suppress these discrete spurs and offer substantially better performance than existing designs. The proposed...
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...
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