Device for continuous phase modulation by frequency synthesizer with phase-locked loop
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United States of America Patent
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Mar 17, 1998
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N/A
app pub date -
Aug 7, 1996
filing date -
Feb 11, 1994
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Abstract
Device for continuous phase modulation, produced from a frequency synthesizer including a variable oscillator and a phase-locked loop with, in series, a frequency division circuit, a phase comparator and a low-pass filter. In order to reduce modulation in the loop, the modulation is applied not only to the input of the synthesizer but also, in compensation, in the loop. In order to eliminate the modulation residue in the loop, a control signal for the oscillator is derived by a circuit which performs a correlation between the residue of the modulation and the output signal from a filter producing the same filtering effect as the loop, and which receives the modulation signal from the input of the synthesizer.
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