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2. An efficient design method of microwave oscillator circuits for minimum phase noise

Author

Prigent, M., Camiade, M., Nallatamby, J.C., Guittard, J., and Obregon, J.

Subjects
Microwave oscillators -- Design and construction, Microwave integrated circuits -- Design and construction, Circuit design -- Methods, Microwave communications -- Equipment and supplies, Business, Computers, Electronics, Electronics and electrical industries
Abstract

In this paper, we describe a newly developed design method of high-Q microwave oscillator circuits leading to the minimum phase noise for a given transistor and resonator. The key point of the method is the maximization of the energy stored in the resonator and its transfer to the controlling input voltage port of the transistor. The proposed method has been applied to two experimental oscillators setups with pseudomorphic high electron-mobility transistors. A state-of-the-art phase noise of -50 dBc [at] 10-Hz offset from carrier with a 1/[f.sup.3] slope has been measured at room temperature with a 9.2-GHz oscillator. The efficiency of this design method and its ease of use represent, in our opinion, a real breakthrough in the field of low-noise transistor oscillator circuit design.

Published
1999

18. A new approach to nonlinear analysis of noise behavior of synchronized oscillators and analog-frequency dividers. (Short Papers)

Author

Nallatamby, J.C., Prigent, M., Sarkissian, J.C., Quere, R., and Obregon, J.

Subjects
Oscillators (Electronics) -- Analysis, Electromagnetic noise -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

An original theory of phase noise in synchronized oscillators is outlined through the phase-locked loop (PLL) approach. The phase-noise spectrum obtained first by the analytical PLL theory and then by the simulator developed in [1] have been compared with very good accuracy. This new approach permits the best understanding of noise conversion in synchronized devices.

Published
1998

21. New approach of nonlinear analysis of noise behavior of synchronized oscillators and analog-...

Author

Nallatamby, J.C., Prigent, M., Sarkissian, J.C., Quere, R., and Obregon, J.

Subjects
*AUDIO-frequency oscillators, *ELECTRIC circuits, *PHASE-locked loops
Abstract

Describes a nonlinear analysis of noise behavior for use in synchronized oscillators and other unstable circuits, using the phase-locked loop (PLL) approach. Information on the phase-noise spectrum obtained by the analytical PLL theory and simulator development; Effects of injected noise; Discussion on the original approach to predict the noise behaviour of a synchronized oscillator based PLL theory.

Published
1998
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