Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Reexamination Certificate
2006-09-26
2006-09-26
Chang, Joseph (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
C331S094100, C331S003000
Reexamination Certificate
active
07113046
ABSTRACT:
The invention relates to a device (1) for producing a reference frequency signal (Se) from the response of an atomic resonator (R) to a pumping signal (Fat) transmitted thereto, comprising: a first oscillator for production of a first signal (S1) of frequency (F0) as a function of the response signal (E1) from the resonator (R); a second oscillator (13) for production of a second signal (S2) at a frequency (NF0) which is equal to a whole multiple of that of the first signal (S1). According to the invention, the second oscillator is selected to produce a second signal (S2) close in frequency to the frequency of resonance for the resonator (R).
REFERENCES:
patent: 5148122 (1992-09-01), Karlquist
Patent Abstracts of Japan, vol. 1999, No. 12, Oct. 29, 1999—& JP 11 205138 A (NEC Miyagi Ltd; NEC Corp), Jul. 30, 1999 abstract.
Barillet R et al: Limitation of the Clock Frequency Stability by the Interrogation Frequency Noise: Experimental Results: IEEE Transactions on Instrumentation and Measurement, IEEE Inc. New York, US, vol. 42, No. 2, Apr. 1, 1993, pp. 276-280, XP000387467 ISSN: 0018-9456, p. 276, col. 2, line 13-p. 277, col. 2, line 6; figure 1.
Koga Y et al.:“A Microwave Exciter for CS Frequency Standards Based on a Sapphire-Loaded Cavity Oscillator” IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, IEEE Inc. New York, US. vol. 48, No. 1, Jan. 2001, pp. 1-5, XP001050962 ISSN: 0885-3010 p. 1, col. 2, paragraph II-p. 2, col. 2, last line; figures 1,3.
Gupta A S et al: “Cs frequency synthesis: a new approach” Proceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium, vol. 2, 1999, pp. 615-619, XP010377731 cited in the application p. 615, col. 2, line 18, p. 616, col. 1, line 22; figure 1.
Karlquist R K: “A New RF Architecture for Cesium Frequency Standards” Proceedings of the Frequency Control Symposium. Hershey, May 27-29, 1992, New York, IEEE, US, May 27, 1992, pp. 134-142, XP000341347 ISBN: 0-7803-0476-4 cited in the application p. 137, col. 1, line 43-p. 139, col. 1, line 2; figures 3, 4.
Audoin Claude
Barillet Roland
Hamouda Frederic
Centre National d'Etudes Spatiales
Centre National de la Recherche Scientifique (C.N.R.S.)
Chang Joseph
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