La figura 1 muestra la configuración básica donde Rg es la resistencia interna del generador y RL la resistencia de carga.

 

Figura 1
Figura 1

 

 

Nota: El índice "b" con los parámetros híbridos que indican que son para la base común se han suprimido para hacer más simple su uso. Así, en lugar de escribir h21b escribimos h21.

 

Fórmula 1

Ganancia de corriente:

Gi = Ic / Ie

 

Gi = h21 / (1 + h22 x Rl)

 

Donde:

Las magnitudes se definen en la tabla 1

RL es la resistencia de carga en ohms

 

Fórmula 2

Ganancia de tensión:

*Gv= Ubc / Ube

*Gv = ( h21 x Rl ) / [ h11 + det(h) x Rl ]

 

Donde:

GV es la ganancia de tensión

Otras magnitudes definidas en la tabla 1

RL es la resistencia de carga en ohms

 

 

Fórmula 3

Resistencia de entrada:

 

Rin = Ubc / Ic

Rin = [ h11 + det(h) x RL ] / [ 1 + h22 x RL ]

 

Cuando :

Rin es la resistencia de entrada en ohms

Otras magnitudes dadas por la tabla 1

 

Fórmula 4

Resistencia de salida:

Rout = Ubc / Ie

Rout = ( h11 + Rg) / [ det(h) + h22 x Rg ]

 

Cuando :

Rout es la resistencia de salida en ohms

RG es la resistencia del generador (ohms)

Otras magnitudes en la tabla 1

 

Fórmula 5

Ganancia de potencia:

Gp = Gi x Gu

Gp = (h212 x R) / { ( 1 + h21 x RL ) x [ h11 + det(h) x RL ] }

 

Donde

Gp es la ganancia de potencia

Gi es la ganancia de corriente

Gv es la ganancia de tensión

RL es la resistencia de carga en ohms

Otros parámetros dados por la tabla 1.

 

Fórmulas derivadas:

 

Fórmula 6

Cuando la impedancia de entrada está casada con la resistencia de entrada (Ri = RG) se da la siguiente fórmula para calcular la ganancia de potencia:

 

 

 

 

Donde:

Gp es la ganancia de potencia

Rg es la resistencia del generador en ohms

RL es la resistencia de carga en ohms

Otros parámetros dados por la tabla 1.

 

Tabla 1 - Símbolos literales y abreviaturas para Transistores

(Aplicados a las fórmulas de 1 a 6)

Símbolo Término
Det(h) Determinante h
Gi Ganancia de corriente
Gv Ganancia de tensión
Gp Ganancia de potencia
h11 Impedancia de entrada con salida en corto
h12 Factor de amplificación de tensión inversa en circuito abierto
h21 Factor de amplificación directa en corto
h22 Admitancia de salida con salida abierta
I1 Corriente de entrada
I2 Corriente de salida
Ib Corriente de base
Ic Corriente de coletor
Ie Corriente de Emisor
RG Resistencia del generador
RL Resistencia de carga
U1 Tensión de entrada
U2 Tensión de salida
Ubc Tensión entre base y colector
Ube Tensión entre base y emisor
Uce Tensión entre colector y emisor

 

 

 

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