The DPLL is a digital loop filter/controller designed to be used in conjunction with Silicon Creations Fractional-N PLLs. The resulting dual-loop PLL can attenuate jitter in extremely noisy reference ...

This converter normally is a simple low pass filter. It is called “loop filter”. Fig. 1: Traditional PLL The jitter of the VCO and so the jitter of the output frequency is due to different mechanisms.

Now, we know what you’re thinking — he must have used some kind of PLL to give an electromagnetic “kick” to the bob to trim the pendulum’s period. Good guess on the PLL, but the trimming ...