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US 2002/0160730 A1Published application
Frequency synthesizer and method of low-noise frequency synthesis
OwnerFranck Nozahic, Fabrice Jovenininventors
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OwnerFranck Nozahic, Fabrice Jovenininventors
Estimating the term…
A frequency synthesizer including a phase-locked loop (10), which phase-locked loop (10) comprises: a frequency divider (14) having integral dividing ratios, connected between a voltage-controlled oscillator VCO (12) and a phase-frequency comparator PFD (16), a sigma-delta modulator (30), connected to the frequency divider (14) for commuting the dividing ratio of the frequency divider between a series of at least two integral values, so as to obtain a resulting mean dividing ratio of fractional component, the modulator having at least a digital input (34, 50) suitable for receiving an adjusting instruction of the fractional component. In accordance with the invention, the frequency synthesizer further includes: means for fixing the value of the least significant bit of the adjusting instruction to 1.
A frequency synthesizer including a phase-locked loop (10), which phase-locked loop (10) comprises:
A method of synthesizing frequency by means of a phase locking synthesizer, comprising:
A frequency converter comprising a mixer (200) which has a first input connected to a signal source which delivers a signal with a frequency to be converted, and comprising a signal source (1) which has a reference frequency connected to a second input of the mixer, characterized in that the signal source (1) which has a reference frequency comprises a frequency synthesizer as claimed in any one of the preceding claims.
Dependencies are inferred from the claim text.