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In this article the contribution of the digital $$\Upsigma\Updelta$$ modulator in fractional frequency synthesizers is explored. Due to the circuit’s non linear behavior, the spur tones generated by the digital $$\Upsigma\Updelta$$ modulation degrade the synthesizer’s phase noise even in regions where the charge pump noise is dominant. A new method to dither digital MASH $$\Upsigma\Updelta$$...
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