A 0.5 to 2.5GHz PLL with Fully Differential Supply-Regulated Tuning

Abstract

A PLL uses a fully differential supply-regulated tuning scheme to combat power-supply noise. The charge pump uses a resistor to set the current and reduce the flicker noise corner. Fabricated in a 0.18mum CMOS process, the PLL area is 0.15mm2. Operating at 2.4GHz, it has 3.29psrms jitter, a frequency range of 0.5 to 2.5GHz, and draws 14mA from a 1.8V supply