A 0.1-3 GHz Wide Bandwidth Ring VCO Fractional-N PLL with Phase Interpolator in 8 nm FinFET CMOS

This paper proposes a multi-phase ring oscillator based fractional-N phase locked loop (FNPLL) frequency synthesizer using phase interpolator for high-speed serial link. This paper aims to reduce quantization noise by employing subinteger divider, extending PLL bandwidth. Fabricated in 8 nm CMOS process, the proposed FNPLL operates over wide frequency range of 0.1-3 GHz. The proposed FNPLL achieves 1.49 ps rms integrated jitter at 3 GHz output. The proposed FNPLL achieves wide BW up to 2 MHz using a 25 MHz reference clock.