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Tecnología de Alta Frecuencia
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DEPARTAMENTO DE INGENIERÍA AUDIOVISUALY COMUNICACIONES
TECNOLOGÍA DE RADIOCOMUNICACIONES
PROBLEMAS 6 puntos
DURACIÓN: 90 minutos (con resumen) 24 de Enero de 2001
===========================================
APELLIDOS:
NOMBRE: DNI:
..............................................................................................................
PROBLEMA 1.
Queremos diseñar un amplificador de mínimo ruido. Para conseguir este objetivo la
impedancia que el transistor ha de ver a su entrada es: Zop=60-12j S.
Datos:
Z0=Z1=50S Z2=75S Z4=100S Zc=-25jS
S11=0,3 S12=0,1j
S21=2,5 S22=-0,4
,a) Diseñar la red de adaptación
de entrada según el esquema
25 j Yop
indicado en la figura. L1, Z1
(Nota: L1$0)
Z0
Yb
L2, Z 2
Yop Ya Yb
Z op 60 12 j Yop 0,016 0,0032 j
Yop 0,8 0,16 j
Z L 50 25 j YL 0,8 0,4 j
Y ' a 0,8 0,4 j L1 0,287 103,3º Nos situamos en la Carta de Smith en YL y
Y ' b Y ' a Yop 0,56 j nos movemos hacia generador hasta cortar con parte
real=0,8.
Obtenemos:
Normalizamos a 75 S y tenemos que:
Y ' b 75 0,84 j L2 0,112 41º
2
, La otra solución que tenemos es dando una
Ya'' YL 0,8 0,4 j L1'' / 2 180º
vuelta completa en la carta de Smith(180º),
Yb'' 0,24 j
obteniendo:
Yb'' 75 0,36 j L2 0,445 160º
L2 0,112
L1'' / 2
YL Ya''
Ya'
L'1 0,287
3
, b) Analizar la estabilidad y calcular la MAG.
S 21
G MAG K K 2 1 8,415 9,25dB
S12
S11 S 22 S 21 S12 0,277 115
2 2 2
1 S11 S11
K 1,65
2 S12 S 21
1
Incondicionalmente estable
K 1
S12 S 21 op c) Diseñar la red de adaptación de salida para la máxima
S ' 22 S 22
1 S11 op
ganancia.
Z op Z 0 60 12 j 50
S' 0,37 0,025 j op 0,1 0,1 j
22
Z op Z 0 60 12 j 50
Para conseguir máxima ganancia:
S S 22
'
0,37 0,025 j
1 S
Z S Z0 22,8 1,32 j YS 0,0437 0,0025 j
1 S
YS
/4
Z3 Z0
YL4
Z4
L4
4
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