Patent ID: 6946916

Claim:
An arrangement for phase locking of a Voltage Controlled Oscillator (VCO) to a selected frequency harmonic among a number of predetermined or available frequencies (harmonics), comprising a reference generator for generating a reference frequency, a phase lock loop for producing an output signal in response to the input reference frequency, said phase lock loop comprising a phase detector, a loop filter, said VCO, adding means and a power splitter, a sweep generator further being provided, characterized in that it further comprises or is associated with storing means for storing information about, for each selectable or available frequency harmonic, a first (coarse) control voltage providing a VCO frequency output which is lower/higher than, and differs from the selected frequency (harmonic) by a given value, that the sweep generator adds a controllable sweep voltage to/on the first control voltage at least until a varying, second difference between the output VCO frequency and the selected frequency harmonic reaches a given value, monitoring/detecting means being provided for detecting the varying, second difference between the selected frequency harmonic and the VCO output frequency, and in that sweep generator control means are provided for reducing the sweep rate until the VCO is phase locked to the selected frequency harmonic.