Contribution à la conception optimale en terme de linéarité et ...
Contribution à la conception optimale en terme de linéarité et ...
Contribution à la conception optimale en terme de linéarité et ...
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Figure III.9 - Contours <strong>à</strong> puissance <strong>de</strong> sortie constante (Ps=120 mW, Zin(2f0)) .................... 98<br />
Figure III.10 – Influ<strong>en</strong>ce <strong>de</strong> l’impédance <strong>de</strong> charge <strong>à</strong> f0 ....................................................... 100<br />
Figure III.11 – Influ<strong>en</strong>ce <strong>de</strong> l’impédance <strong>de</strong> charge <strong>à</strong> 2f0 ..................................................... 100<br />
Figure III.12 – Influ<strong>en</strong>ce <strong>de</strong> l’impédance <strong>de</strong> source <strong>à</strong> 2f0 ..................................................... 101<br />
Figure III.13 – Caractéristique <strong>de</strong> bruit d’un amplificateur ................................................... 102<br />
Figure III.14 – optimisation <strong>en</strong> consommation ...................................................................... 103<br />
Figure III.15 – Rapport signal <strong>en</strong> bruit <strong>en</strong> fonction du nombre <strong>de</strong> cellules ........................... 104<br />
Figure III.16 – Comparaison <strong>de</strong> <strong>de</strong>ux amplificateurs............................................................. 105<br />
Figure III.17 – Critère d’optimisation.................................................................................... 106<br />
Figure III.18 – Equival<strong>en</strong>ce <strong>de</strong>s critères................................................................................. 106<br />
Figure III.19 – Lieu <strong>de</strong>s optima.............................................................................................. 107<br />
Figure III.20 – Banc <strong>de</strong> test.................................................................................................... 108<br />
Figure III.21 – Résolution graphique ..................................................................................... 109<br />
Figure III.22 – Algorithme d’optimisation............................................................................. 110<br />
Figure III.23 – Comparaison <strong>de</strong> <strong>de</strong>ux cellules ....................................................................... 112<br />
Figure III.24 – Application <strong>à</strong> <strong>la</strong> <strong>conception</strong> d’un amplificateur............................................. 114<br />
Figure III.25 – Lieu <strong>de</strong>s optima.............................................................................................. 115<br />
Figure III.26 – Influ<strong>en</strong>ce <strong>de</strong>s impédances <strong>de</strong> charge <strong>à</strong> f0....................................................... 116<br />
Figure III.27 - Influ<strong>en</strong>ce <strong>de</strong>s impédances <strong>de</strong> charge <strong>à</strong> 2f0 ..................................................... 117<br />
Figure III.28 – Répartition <strong>de</strong>s impédances simulées ............................................................ 118<br />
Figure III.29 – Influ<strong>en</strong>ce <strong>de</strong> l’impédance <strong>de</strong> source <strong>à</strong> 2f0 ..................................................... 119<br />
Figure III.30 – Influ<strong>en</strong>ce du point <strong>de</strong> po<strong>la</strong>risation ................................................................. 120<br />
Figure III.31 – Méthodologie <strong>de</strong> <strong>conception</strong> d’un amplificateur <strong>de</strong> puissance...................... 123<br />
FigureIV.1 – Comparaison mesures/modèle pour un fonctionnem<strong>en</strong>t <strong>à</strong> 2 porteuses............. 135<br />
FigureIV.2 – Facteur K <strong>et</strong> B sur <strong>la</strong> ban<strong>de</strong> [0-20 GHz]........................................................... 137<br />
FigureIV.3 – Exemple <strong>de</strong> topologie perm<strong>et</strong>tant <strong>de</strong> stabiliser un transistor............................ 137<br />
FigureIV.4 – Cercles <strong>de</strong> stabilité du transistor HFET............................................................ 138<br />
FigureIV.5 – Impédances <strong>optimale</strong>s <strong>et</strong> leurs cycles <strong>de</strong> charge associés ................................ 140<br />
FigureIV.6 – Caractéristiques C/(N+I3) ................................................................................. 141<br />
FigureIV.7 – C<strong>la</strong>sse AB légère .............................................................................................. 142<br />
FigureIV.8 – C<strong>la</strong>sse AB profon<strong>de</strong>.......................................................................................... 142<br />
FigureIV.9 – Principe d’adaptation........................................................................................ 144<br />
FigureIV.10 - Impédances <strong>de</strong> charge synthétisées ................................................................. 144<br />
FigureIV.11 – Layout du circuit............................................................................................. 145