Realignment strength controller for solving loop conflict of realignment phase lock loop

摘要

A circuit having a tracking loop and a realignment loop is disclosed. The circuit includes: a phase frequency detector (PFD) module for comparing a phase difference of a first input signal and a second input signal; a pump module for converting PFD phase error to charge, wherein the pump module further comprises a low pass filter (LPF); an adjustable realignment module for adjusting a realignment strength, the adjustable realignment module receives a first plurality of inputs from the PFD module, the adjustable realignment module transmits a second plurality of outputs to the pump module; and a ring oscillator unit, the ring oscillator unit receives a first input from the pump module and a second input from the adjustable realignment module, and based on the first and second inputs produces a feedback signal.