Patent ID: 7268640

Claim:
A frequency generator arrangement, comprising a first voltage controlled oscillator generating a first oscillator signal of a given multiple of a predetermined raster frequency, a second voltage controlled oscillator generating a second oscillator signal of another given multiple of a predetermined raster frequency, one or more dividers connected to the output of each oscillator, dividing the output signal of the oscillator until the frequency of both divided output signals is equal to the raster frequency, a filter arrangement performing a low pass filtering on the signal at the output of the one or more dividers, and a single sideband mixer, having as input the output signals of the oscillators and the output signal of the filter arrangement, the mixer producing as output a signal having a frequency which is equal to the frequency of the output signal of either one of the oscillators or to the frequency of the output signal of either one of the oscillators from which the output signal of the filter arrangement has been subtracted or to which the output signal of the filter arrangement has been added.