A Sub-100 Fs RMSjitter 20 GHz Fractional-N Analog PLL With a BAW Resonator Based On-Chip 2.5 GHz Reference. - Sachin Kalia; Salvatore Finocchiaro; Tolga Dinc; Bichoy Bahr; Ashwin Raghunathan; Gerd Schuppener; Siraj Akhtar; Tobias Fritz; Baher Haroun; Benjamin Cook; Swaminathan Sankaran (IEEE J. Solid State Circuits, 2022)