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In this paper a closed form expression for the phase-to-frequency-detector (PFD) output error, in Fractional Frequency Synthesizers, is obtained. It is demonstrated that the limit frequency of operation for the PFD not only depends on the reset delay signal but also in the setup time of the PFD. With this equations a suitable delay in the reset signal can be selected.
An accurate Noise description in behavioral models for Fractional-N Frequency Synthesizers is presented. It is demonstrated that a noise-addition-like synthesizerpsilas model yields a better Phase-Noise prediction than a time-domain jitter model. This allows a more direct analysis of the noise contribution of every circuit in the Frequency Synthesizers and avoids simulation inaccuracies when very...
By using a structured dither addition it is demonstrated how a very simple 8-bit linear feedback shift register (LFSR) can be used to randomize a digital MASH 1-1-1 SigmaDelta modulator used for fractional-N frequency synthesizers. With this optimization, spur tones for high frequency offset from the carrier are avoided without significant area and power budget increase.
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