GENERATOR AND METHOD FOR GENERATING A CONTROLLED FREQUENCY
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United States of America Patent
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Issued Date -
Jun 2, 2022
app pub date -
Feb 24, 2020
filing date -
Feb 24, 2020
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Abstract
A frequency generator for generating a controlled signal having a controlled frequency uses a frequency ratio generator with an input; a frequency divider for dividing the controlled frequency by a frequency ratio signal to generate a divided signal having a divided frequency; a converter for generating an excitation signal having the divided frequency, the excitation signal exciting a resonator for generating a resonance signal having a resonance frequency; a frequency phase detector of a phase difference between the divided frequency and the resonance frequency; an inner loop filter for generating the frequency ratio signal and filtering the phase difference signal to prevent instability of two frequency ratio generator loops; an output configured for providing the frequency ratio signal based on a ratio between the controlled frequency and the resonance frequency; a controlled oscillator circuit for connecting an oscillator generating an oscillating signal having an oscillator frequency; and a PLL (Phase Locked Loop) for generating the controlled signal based on the oscillator frequency, which is adapted based on comparison of the frequency ratio with a target ratio.
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