A ring-VCO-based sub-sampling PLL CMOS circuit with 0.73 ps jitter and 20.4 mW power consumption

Abstract

This paper presents a ring voltage-controlledoscillator (ring-VCO)-based sub-sampling phase locked loop(PLL) CMOS circuit with low phase noise and low jitter. A 2.08 GHz PLL is developed by use of 65 nm CMOS technology. The in-band phase noise is -119.1 dBc/Hz at 1 MHz and the output jitter integrated from 1 kHz to 10 MHz is 0.73 ps (rms) with the power consumpition 20.4 mW. The normalized jitter-power product is -229.7 dB.