Patent ID: 6952141

Claim:
A VCO control circuit operable to control the tuning range of one or more tuning circuits, the control circuit comprising: a variable delay block having a signal input configured to receive a reference signal, a delay input configured to set the delay amount applied to the reference signal, and an output to provide the delayed reference signal, wherein two or more different delays may be applied to the reference signal; a delay counter having an input coupled to receive the delayed reference signal and an output configured to output a delay counter output signal; and a tuning range selector having an input coupled to receive the delay counter output signal, and an output coupled to one or more tuning circuits, the tuning range selector operable to control the tuning range of the one or more tuning circuits; wherein, upon receiving the delay counter output signal, the output of the tuning range selector changes the tuning range of the one or more tuning circuits.