PLL On-Chip Jitter Measurement: Analysis and Design

Analysis of on-chip jitter measurements based on the dead-zone method reveals potentially large errors in the jitter variance estimate, when the jitter distribution is changing or not known a priori. To overcome this, a more accurate variance estimation method is proposed and experimentally verified. The residual error, caused by the correlated noise between the PLL and the measurement circuit, is fully characterized and circuit topologies are proposed to mitigate this type of error