Phase-locked loops (PLLs) are indispensable timing and frequency synthesis circuits, finding application in communication transceivers, clock distribution, navigation receivers and sensor interfaces.

Optical phase-locked loops (OPLLs) are closed-loop control systems that stabilise and synchronise the phase of a slave laser with respect to a reference source, enabling coherent optical generation ...

This is Part 1 of a three-part series. As modern wireless communications systems (mainly superheterodyne radio transceivers) are now required to deliver higher performance than ever before, they’re ...