Patent ID: 7609118

Claim:
Apparatus for calibration of a phase-locked loop including a frequency divider, the apparatus comprising: logic to automatically calibrate an integration filter of the phase-locked loop based on a predefined filter transfer function, wherein said calibration is independent of the frequency divider parameters and the integration filed is calibrated by setting the value of one or more components of the integration filter to achieve a desired RC product set to achieve a predefined RC time constant, wherein the components include a resistive component and a capacitive component and the resistive component is set to achieve the desired RC product based on the value of the capacitive component, and wherein the logic to automatically calibrate an integration filter includes: a plurality of resistive elements; a plurality of switches configured to couple ones of the plurality of resistive elements to a charging current circuit; a first transistor coupled to a first of the plurality of resistive elements; an amplifier circuit coupled to the first transistor, said amplifier circuit configured to fix a charging current based on a reference voltage; and logic to automatically calibrate a charge pump current of the phase-locked loop, wherein the integration filter and charge pump current are calibrated to achieve a desired phase-locked loop performance level.