A PVT-Tolerant >40-dB IRR, 44% Fractional-Bandwidth Ultra-Wideband mm-Wave Quadrature LO Generator for 5G Networks in 55-nm CMOS. - Piri, Farshad; Bassi, Matteo; Lacaita, Niccolo R.; Mazzanti, Andrea; Svelto, Francesco (IEEE Journal of Solid-State Circuits, 2018)