Oscillator Frequency Stability Improvement by Means of Negative Feedback

Abstract : A novel, simple method is proposed to increase the frequency stability of an oscillator. An additional negative feedback is used in combination with the positive loop of the harmonic oscillator to decrease the phase sensitivity to fluctuations of parameters other than the resonator. The main advantage of the proposed correction approach is that it does not require expensive external elements such as mixers or resonators. The validity of the method is theoretically demonstrated on a Colpitts oscillator using the control system theory approach and numerical simulations, and is experimentally verified with phase noise measurements of an actual oscillatormockup. It is shown that the medium-term frequency stability can be easily improved by a factor of ten.
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M. Goryachev, S. Galliou, P. Abbe, V. Komine. Oscillator Frequency Stability Improvement by Means of Negative Feedback. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Institute of Electrical and Electronics Engineers, 2011, 58 (11), pp.2297 - 2304. ⟨10.1109/TUFFC.2011.2087⟩. ⟨hal-00660546⟩



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