Thomson Trt Defense

Thierry Ginestet

Jean-Luc De Gouy

Elie Brunet

A frequency synthesizer comprises a single phase-locked loop controlled by a reference clock formed by a voltage-controlled oscillator, a programmable divider with variable division rank M, a phase detector, and a loop filter. It also comprises a predetermined number n of fractional division structures, each implementing a frequency step P,&times;F,lower than the reference frequency F,. Each fractional structure is coupled in parallel with said programmable divider to add to said division rank M fractional increments P,such that the ratio between the frequency F,provided by said oscillator and said reference frequency be defined as a function of said increments P,by the relationship:

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Fontenay, France

Thierry Ginestet