0.012 mm 2 800 µW 0.1–6.4 GHz multi‐protocol PLL with 14 ps rms integrated jitter in 28 nm FD‐SOI

Abstract

A multi-protocol PLL suitable for different wireline standards namely HDMI1.4, USB2.0, DDR4, DisplayPort1.2 and for host clock generation for low-power system-on-chips is presented. The PLL employs automatic VCO gain and charge-pump current calibration circuits to provide a near constant PLL bandwidth which enables a robust jitter performance across process, voltage, temperature. Without increasing the loop-filter capacitor, dual-path loop-filter technique is employed to reduce output jitter due to thermal noise of loop-filter resistor. The PLL designed in 28 nm fully depleted silicon on insulator (FD-SOI) process has an output frequency range from 0.1 to 6.4 GHz, total rms integrated jitter of 14 ps at 21.25 MHz reference frequency, consumes 800 μW at 3.4 GHz VCO frequency and occupies an area of 0.012 mm 2 .