4.48GHz 0.18μm SiGe BiCMOS Exact-Frequency Fractional-N Frequency Synthesizer with Spurious-Tone Suppression Yielding a -80dBc In-Band Fractional Spur. - Michael Peter Kennedy; Yann Donnelly; James Breslin; Stefano Tulisi; Sanganagouda Patil; Ciaran Curtin; Stephen Brookes; Brian Shelly; Patrick Griffin; Michael Keaveney (ISSCC, 2019)