By E. L. Kollberg (auth.), Horst Groll, Ivan Nedkov (eds.)
Microwave Physics and Techniques discusses the modelling and alertness of nonlinear microwave circuits and the issues of microwave electrodynamics and purposes of magnetic and excessive Tc superconductor constructions. facets of complicated tools for the structural research of fabrics and of MW distant sensing also are thought of. the twin concentrate on either HTSC MW gadget physics and MW excitation in ferrites and magnetic motion pictures will foster the interplay of experts in those diverse fields.
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Then the advantages of the nonlinear simulation approach are described, together with the model-related inaccuracies that are responsible of unacceptable calculated phase noise values in special biasing conditions. 1. Introduction The evaluation of RF or microwave oscillators near carrier phase noise remains a difficult task in spite of decades of research efforts [1-5]. The design of a low phase noise oscillator goes through different steps such as : 1) choosing the active device and the resonator 2) finding an equivalent electrical model of these elements 3) choosing an oscillator topology 4) optimizing the oscillator topology through linear simulation 5) calculating (and optimizing) the precise value of the output frequency, the output power, and the phase noise through nonlinear simulation 6) realizing the oscillator and the associated elements (such as a shielded housing or a temperature control) 7) characterizing the oscillator performances (frequency stability, phase noise ...
The two approaches have both advantages and disadvantages. The equivalent circuit approach is simpler, since it is easy to incorporate it into HB simulators, but not so accurate as the analytical approach. At operating frequency much lower than one divided by the trapping time constant (typically in the millisecond range), the transconductance, gm(ro), and the channel conductance, Gds(ro), equal the DC value. At high frequencies, when the traps are frozen, the transconductance and the channel conductance reach their RF values.
On Space Terahertz Technology, Charlottesville, VA. 29. J. Kawamura, R. -y. E. Tong, G. Gol'tsman, E. Gershenzon, and B. Voronov (1996) Superconductive NbN Hot-Electron Bolometric Mixer Performance at 200-250 GHz, presented at 7th Int. Symp. on Space Terahertz Technology, Charlottesville, VA. 30. B. S. Karasik, G. N. Gol'tsman, B. M. Voronov, S. I. Svechnikov, E. M. Gershenzon, H. Ekstrom, S. Jacobsson, E. Kollberg, and S. K. Yngvesson (1995) Hot Electron Quasioptical NbN Superconducting Mixer, IEEE Trans.