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Sumario Tecnología de Alta Frecuencia

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  • March 22, 2021
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  • 2016/2017
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DEPARTAMENTO DE INGENIERÍA AUDIOVISUAL
Y COMUNICACIONES


MICROONDAS
PROBLEMAS 6 puntos
DURACIÓN: 120 minutos ( CON RESUMEN ) 22 enero de 2003
..................................................................................
APELLIDOS:
NOMBRE: DNI:


PROBLEMA. 2.- Se pretende diseñar un amplificador de mínimo ruido a 10 Ghz. con un
transistor cuyos parámetros S son:


S11 = - 0,3 S12 = 0,2
S21 = - 1,8 S22 = 0,4


Para ello se realiza el siguiente montaje, utilizando un generador de 10 GHz. con
resistencia interna de 50 ohmios y una impedancia serie. A continuación se varía el valor
de la impedancia hasta medir el mínimo factor de ruido posible. En este momento se
retira el amplificador y se mide el valor de D obteniendo D= 0,2+ 0,4j.




a) Calcular el valor de Z y obtener su modelo equivalente con elementos concentrados.
Obtener así mismo el valor de Yop, analizar la estabilidad del amplificador y en su caso
calcular la MAG.




1

,El amplificador se realizará con la siguiente topología, en la que se conectará a la entrada
una antena receptora:




Datos:
Zo =Z2=Za 50 S Z1 = 100 S Z4 = 50 S
L3 = 90º




b) Diseñar la red de adaptación de entrada según el esquema indicado en la figura para
mínimo ruido.




2

, c) Calcular Ds para máxima ganancia.




d) Calcular la ganancia del amplificador. Comparela con la MAG y comente los resultados
obtenidos.




3

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