Method and device for generating a clock signal
AssigneeInfineon Technologies AG
InventorsNicola Da Dalt, Peter Gregorius
Life of this patent
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Abstract
A method and a device for generating a clock signal (Fout) are provided, wherein a digital phase difference signal (X) is formed depending on a phase difference between a reference clock signal (Fin) and a feedback signal (Ffb) derived from the clock signal (Fout) and wherein the digital phase difference signal (X) is digitally filtered, in order to form a digital filtered phase difference signal (U). A digitally controlled oscillator (5) is activated by a digital control signal dependent on the digital filtered phase difference signal (U) to generate the clock signal (Fout). With a device of this kind clock signals with frequencies in the gigahertz range can be generated with a minimum of analog circuit parts.
Claims32
1-32. (canceled)
A method for generating a clock signal, comprising:
- a) forming a phase difference signal based at least in part on a phase difference between a reference clock signal and a feedback signal derived from the clock signal;
- b) digitally filtering the phase difference signal in order to form a filtered phase difference signal, and
- c) controlling a digitally controlled oscillator to generate the clock signal at least in part using a digital control signal, the digital control signal dependent on the filtered phase difference signal.
A device for generating a clock signal, comprising:
- a phase detector configured to generate a phase difference signal as a function of a reference clock signal and a feedback signal derived from the clock signal,
- a digital filter operably coupled to the phase detector and configured to filter the phase difference signal to form a filtered phase difference signal, and
- a digitally controlled oscillator operably coupled to the digital filter and operable to generate the clock signal as a function of a digital control signal that corresponds to the filtered phase difference signal.
Dependencies are inferred from the claim text.