Patent ID: 7885369

Claim:
A phase locked loop frequency generator for generating an output signal with a settable target frequency, the phase locked loop frequency generator comprising: a voltage-controlled oscillator for generating the output signal based on a control voltage; a switchable frequency divider connected to the voltage-controlled oscillator, for deriving a frequency-divided signal whose instantaneous frequency is based on a value of an adjustable divisor which divides the output signal; a switchable delay unit connected to the frequency divider for generating a delayed signal, the frequency-divided signal being delayed by delay times that are based on a control word and a control signal; a controller have a first output connected to said switchable frequency divider to provide said adjustable divisor and a second output connected to said switchable delay unit to provide said control word; a phase detector connected to the switchable delay unit for determining a phase difference between a reference signal and the delayed signal and for providing the phase difference for generating the control voltage; and a calibration unit connected to the switchable delay unit for deriving the control signal from the reference signal.