Phase locked loop design with switch for loop filter capacitance leakage current control

摘要

A phase locked loop design that uses a switch operatively connected to a loop filter capacitor to control a leakage current of the loop filter capacitor is provided. By positioning a switch in series with the loop filter capacitor, the leakage current of the loop filter capacitor may be controlled by switching the switch "on' when a charge pump of the phase locked loop is "on' and switching the switch "off' when the charge pump is "off,' thereby cumulatively reducing the leakage current of the loop filter capacitor throughput the operation of the phase locked loop. Control and reduction of the loop filter capacitor leakage current leads to more reliable and stable phase locked loop behavior.