A study of a new methodology for 2-type 3-order charge pump PLLs

Abstract EN

We proposed a new methodology for 2-type 3-order Charge Pump-PLLs (CP-PLLs) utilizing loop gain optimization, for which PLL operation are divided into 2-modes, pullin and lock modes.

We derived a set of equations which ensure the stability of the PLLs by avoiding instability problem accompanied by charging the loop states in pull-in mode.

The simulation results using MATLAB shows significant stability of a prototype PLL and verifies the great usefulness of the proposed method.