CHARGE-PUMPING METHOD WITHOUT UP/DOWN CURRENT MISMATCH AND CHARGE-PUMP USING THE SAME

摘要

The method involves generating a pair of sub up currents that vary complementarily with a change in voltage at an output terminal. A pair of sub down currents is generated by a phase frequency detector (902), where the sub down currents varies complementarily with the change in the voltage at the terminal. The generated sub up/down currents remain constant, and are balanced over a range of a voltage at the terminal. Independent claims are also included for the following: (A) a charge pump comprising sub up current sources (B) a phase-locked loop comprising a charge pump.