A DSP method based on sub-sampling followed by M-point FFT of the sub-sampled signal is used to reduce the phase-locked loop's reference spur. To validate the system's effectiveness a digital calibration loop in SIMULINK is designed. The results show that the reference spur can be improved by 22dBc with a 1% residual current mismatch and a 1nA net value of leakage current.I.
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