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REFERENCES

1 
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2 
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3 
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4 
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Elkholy A. , Saxena S. , Nandwana R. K. , Elshazly A. , Hanumolu P. K. , 2016, A 2.0-5.5 GHz wide-bandwidth ring-based digital fractional-N PLL with extended range multi-modulus divider, IEEE Journal of Solid-State Circuits, Vol. 51, No. 8, pp. 1771-1784DOI
10 
Silva-Pereira M. , Vaz J. C. , 2018, Power optimisation of both a high-speed counter and a retiming element for 2.4 GHz digital PLLs, Electronics Letters, Vol. 54, No. 5, pp. 284-285DOI
11 
Zhong J. , Yang X. , Martins R. P. , Zhu Y. , Chan C.-H. , 2023, A 0.016 mm$^2$ active area 4 GHz fully ring-oscillator-based cascaded fractional-N PLL with burst-mode sampling, IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 70, No. 10, pp. 3792-3796DOI
12 
Kang Z.-H. , Liu S.-I. , 2023, A 1.6-GHz DPLL using feed-forward phase-error cancellation, IEEE Journal of Solid-State Circuits, Vol. 58, No. 3, pp. 806-816DOI
13 
Elmallah A. , Zhu J. , Khashaba A. , Megawer K. M. , Elkholy A. , Hanumolu P. K. , 2022, A 3.2-GHz 405 fs$_{rms}$ jitter -237.2 dB FoM$_{JIT}$ ring-based fractional-N synthesizer, IEEE Journal of Solid-State Circuits, Vol. 57, No. 3, pp. 698-708DOI
14 
Lee T. Seong Y. , Hwang C. , Lee J. , Park H. , Lee K. J. , Choi J. , 2020, A 5.5 GHz ring-DCO-based fractional-N DPLL using a time-invariant-probability modulator generating a nonlinearity-robust DTC-control word, Proceedings of the IEEE International Solid-State Circuits Conference (ISSCC), pp. 270-272DOI