Feedback loop frequency synthesizer device
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United States of America Patent
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Nov 29, 2016
Grant Date -
Jul 28, 2016
app pub date -
Jan 22, 2016
filing date -
Jan 23, 2015
priority date (Note) -
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Abstract
This frequency synthesis device comprises a servo circuit for the control of a frequency provided as output by a reference frequency received as input, with this circuit comprising a first phase accumulator clocked at a frequency linked to the reference frequency, a first digital-to-analog converter, a phase comparator, a loop filter and a controlled frequency oscillator providing an electrical signal oscillating at the output frequency. It further comprises a feedback loop connecting the output to the phase comparator, comprising a second phase accumulator clocked at a frequency linked to the output frequency and a second digital-to-analog converter. A reduction in dynamics by quantization is provided between each phase accumulator and each respective digital-to-analog converter, with this quantization being carried out by truncation of digital values of accumulated phases at the output of each phase accumulator.
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