Patent ID: 7355486

Claim:
A method for implementing current-based, phase locked loop control of a frequency generating device, the method comprising: comparing a reference frequency to an output frequency of a current controlled oscillator (ICO) through a phase detector; filtering an output voltage of a charge pump coupled to said phase detector and converting the filtered output voltage to an output current for integral control of said ICO; and configuring a control circuit for proportional control of said ICO, said control circuit receiving increment and decrement outputs of said phase detector, and applying amount of bias current to said ICO, said bias current based on the value of said increment and decrement outputs of said phase detector, wherein said ICO further comprises a first latch-based delay stage having outputs connected to inputs of a second latch-based delay stage, and outputs of said second delay stage coupled back to inputs of said first delay stage; wherein said control circuit generates first and second output bias voltages used to determine the amount of bias current utilized by said first and second latch-based delay stages, said first and second output bias voltages being a function of said integral control output current of said V to I converter.