Patent ID: 7079616

Claim:
A device for generating an output signal with a frequency which varies according to a law of modulation, comprising: a PLL which includes, a phase detector, responsive to the phase difference between an input signal and a feedback signal and which drives, as a function of said difference, an oscillator for generating an output signal, and a feedback path responsive to said signal generated by the oscillator and which generates said feedback signal via at least one divider, wherein said at least one divider has a variable division ratio, and is provided with a control module for selectively varying said division ratio according to said law of modulation, wherein said feedback path of the PLL includes said divider with a variable division ratio according to said law of modulation signal and an additional divider with a fixed division factor, said dividers with variable and fixed division factors respectively, both being responsive to the signal generated by said oscillator and arranged for generating said feedback signal; said feedback path also including a selection unit for operatively connecting, to said phase detector, said divider with a fixed division ratio, to achieve operation of said device with a constant frequency output signal, or said divider with a variable division ratio, to achieve operation of said device with a variable frequency output signal according to said modulation law.