F.  Buccoleri, Dartizio, S. M., Tesolin, F., Avallone, L., Santiccioli, A., Lesurum, A., Steffan, G., Bevilacqua, A., Bertulessi, L., Cherniak, D., Samori, C., Lacaita, A. L., and Levantino, S., ?A 9GHz 72fs-Total-lntegrated-Jitter Fractional-N Digital PLL with Calibrated Frequency Quadrupler?, in 2022 IEEE Custom Integrated Circuits Conference (CICC), 2022.