Patent ID: 7915963

Claim:
A current controlled, phase locked loop device, comprising: a phase detector configured to compare a reference frequency to an output frequency of a current controlled oscillator (ICO), said ICO further comprising 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; a charge pump coupled to said phase detector and a low pass filter coupled to said charge pump; a voltage to current (V to I) converter coupled to said low pass filter, said V to I converter providing an output current for integral control of said ICO; and a control circuit coupled to said ICO, said control circuit receiving increment and decrement outputs of said phase detector, wherein said control circuit is configured to provide proportional control of said ICO through an amount of bias current applied to said ICO, said bias current based on the value of said increment and decrement outputs of said phase detector; 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.