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Mixed‐mode analysis of the sensitivity of a radiofrequency oscillator disturbed by parasitic signals
Author(s) -
Gontrand Christian,
Bouhouche Manel,
Nuñez Perez JoséCruz,
Valorge Olivier,
Calmon Francis,
Verdier Jacques,
Latreche Saïda
Publication year - 2008
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.693
Subject(s) - colpitts oscillator , sensitivity (control systems) , grasp , mixed mode , phase noise , control theory (sociology) , vackář oscillator , computer science , mode (computer interface) , physics , electronic engineering , electrical engineering , engineering , local oscillator , materials science , control (management) , artificial intelligence , programming language , operating system , composite material
The first step of this work is to study the susceptibility of a radiofrequency oscillator to deterministic disturbance sources. A Colpitts oscillator, working around a 4 GHz frequency, contains a heterojunction bipolar transistor with a silicon–germanium base as an active device. A mixed‐mode analysis is involved, applying a microscopic drift diffusion model to the device, whereas the rest of the circuit used is governed by Kirchhoff's laws. We assume that this tool is very relevant to grasp the influence of intrinsic or extrinsic noisy sources of the oscillator. Our first simulation raw results motivate us to discuss, and perhaps extend, via some analytical models, the so‐called impulse sensitivity function model. In this paper, we try to develop quantitative predictions about the phase noise of such oscillators, and to give some new tracks on this field. Copyright © 2008 John Wiley & Sons, Ltd.