Patent ID: 8615202

Claim:
A frequency synthesizer comprising: a first oscillator controlled by a first control device, the first controlled oscillator having a high quality factor, typically greater than 300 and producing a first clock signal RF having a fixed frequency, the first control device controlling the frequency of the first controlled oscillator on the basis of a first reference frequency; a second oscillator controlled by a second control device, and producing a second clock signal, the second control device controlling the frequency of the second controlled oscillator on the basis of a second reference frequency; an integer frequency divider, dividing the frequency of the second clock signal by a variable integer factor N1 and producing a third clock signal, the frequency of which is continuously variable by modifying the factor N1 and the control of the second oscillator; and a first mixer arranged to mix the first and third clock signals, and to produce a fourth RF signal having a variable frequency.