title: 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 oscillator-mockup. It is shown that the medium-term frequency stability can be easily improved by a factor of ten.
authors.affiliation: Time and Frequency Department of the FEMTO-ST Institute, Besançon, France. maxim.goryachev@femto-st.fr
authors.forename: Maxim
authors.initials: M
authors.lastname: Goryachev
authors.forename: Serge
authors.initials: S
authors.lastname: Galliou
authors.forename: Philippe
authors.initials: P
authors.lastname: Abbé
authors.forename: Vadim
authors.initials: V
authors.lastname: Komine
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004581:Electronics / Q000295:instrumentation*; D005246:Feedback; D008962:Models, Theoretical; D009991:Oscillometry / Q000295:instrumentation*