Patent ID: 7327196

Claim:
A phase lock loop device, comprising: a voltage controlled oscillator generating a first VCO signal at a first frequency responsive to a first control voltage; a memory holding a set of adjustment values, with each adjustment value having an associated frequency value; a controller coupled to the memoryalkis and configured to select an adjustment value associated with a second frequency; a voltage generator configured to generate an adjustment signal using the selected adjustment value; a loop filter circuit connected to the voltage generator and to the voltage controlled oscillator, the loop filter circuit configured to generate a second control voltage using: 1) the adjustment signal and 2) a signal indicative of a phase difference between a reference signal and a divided VCO signal; and wherein the controller is coupled to a divider circuit, and the controller signals the divider circuit to change its divide ratio to implement the second frequency; a measurement circuit connected to the voltage controlled oscillator at a point that allows the measurement circuit to measure the voltage of the first control voltage; and wherein the memory is updated to have an updated adjustment value associated with the first frequency.