Patent ID: 7277519

Claim:
A system for frequency and phase correction in a phase-locked loop (PLL), the system comprising: a phase frequency detector operable to: detect a frequency difference and a phase difference between a clock signal and a comparison signal, the comparison signal being derived from an output signal of the PLL; communicate the frequency difference to a first charge pump generating a first current; and communicate the phase difference to a second charge pump generating a voltage; the first charge pump operable to: modify the first current according to the frequency difference; and communicate the first current to a current summer; the second charge pump operable to: modify the voltage according to the phase difference; and communicate the voltage to a voltage-to-current (V2I) converter; the V2I converter operable to: generate a second current corresponding to the voltage; and communicate the second current to the current summer; the current summer operable to: combine the first and second currents with each other to generate a control current for a current-controlled oscillator (CCO); and communicate the control current to the CCO; and the CCO operable to generate one or more oscillating signals according to the first and second currents, a frequency of an oscillating signal from the CCO changing in response to the modification of the first current, a phase of the oscillating signal changing in response to the modification of the second current.