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Novel Fractional Spur Relocation in All Digital Phase Locked Loops

We present a new model that estimates the locations of the fractional spurs relative to the center carrier. Based on this model, we present a novel technique to mitigate the effect of fractional spurs generated in All-Digital Phase Locked Loops. Instead of using power-consuming spur cancellation algorithms, the proposed scheme enables to move the fractional spurs to locations more preferable by the modulation fidelity. This new location of the spurs is decided based on the analytical model of the new scheme. Modulation fidelity is defined in terms of phase noise spectrum which has direct effect on mask and Error Vector Magnitude (EVM) for the transmitter (TX) and Bit Error Rate (BER) and sensitivity for the receiver (RX). Simulation results with this new scheme show that the fractional spurs are estimated correctly and are moved out of the band of the desired modulation, hence improving performance.