0267 Formation Gsm 3g Umts 4g Gprs

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Calcul du taux de modulation m =

U2 max par la méthode du trapèze U0

Avec base de temps

En mode XY

y Umax

m=

Umax – Umin Umax + Umin

Umin

L



x m=

- Umin - Umax

Pour avoir une bonne modulation, il faut que la tension de décalage U0 soit supérieure à l’amplitude de la tension du signal modulant : U0 > U2 max ⇒ taux de modulation m < 1

Si U0 < U2 max on a m > 1 et il y a surmodulation.

L-ℓ L+ℓ

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