The origins and detrimental effects of charge injection in charge-pump PLLs are discussed. Standard topologies for minimizing charge injection are discussed, and a new charge- pump topology with virtually zero charge injection is presented. Simulation results are presented to compare the performance of the proposed topology with standard designs, and it is shown that the new topology minimizes the steady state phase offset.
Published in:
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Date of Conference: 18-21 May 2008