Stable FET Local Oscillator at 11 GHz with Electronic Amplitude Control

Lesartre, Paul; Dessert, Rene; Magarshack, J.

doi:10.1109/euma.1978.332497

Cited by 6 publications

(2 citation statements)

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“…Both models become, however, inconvenient if the nonlinearity can no longer be described by a function between two quantities, or if the active and passive parts of the circuit cannot be separated. This happens, for example in the cases of FET oscillators [8] or of power-combining structures. One should then apply a multiple-port model, which is sketched in Fig.…”

Section: Large-signal Theorymentioning

confidence: 97%

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Unified large-signal stability and noise theory for synchronised oscillators

Knöchel

1981

IEE Proc. H Microw. Opt. Antennas UK

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A unified model is developed which is capable of analysing large-signal performance, stability, and noise of synchronised oscillators under rather general conditions. The passive circuitry is arbitrary; the active subnetwork may in principle contain one-port or two-port devices with or without harmonic content. However, only one-port devices operating at a single frequency are treated explicitly. The active device is modelled by its describing function (i.e. its effective admittance) with respect to both carrier and noise signals. The noise analysis directly leads to a new stability criterion, which clearly shows the restrictions and even failure of the hitherto-used criteria. These results are proved by measurements. Finally, the application of the nonlinear theory to the analysis of multiple-device oscillators is illustrated by results. ) b -modulation frequency in bias circuit b > 0u 5 0i = phase at particular frequencies = real part of a complex frequency u v b -normalised frequencies = time List of symbols Indexes b c = u = / = / = r = Currents i = y y b ,y 0 = y c y t y L = y rb ,y ru ,y rl = y r iu,y r ii Voltages

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Section: Large-signal Theorymentioning

confidence: 97%

“…They can be accounted for by writing (8) for the perturbation voltage. The sign of the attenuation constant a will later on decide whether or not the oscillator is stable.…”

Section: Fig 2 Equivalent Circuit Of Active Device For Rf and Bias Portmentioning

confidence: 99%