Estabilización de Transistor CC

felipegomez

felipegomez

Parámetros conocidos: 𝑉𝐶𝐶=10v Transistor: 2N3904 Corriente deseada: 𝐼𝐶=100 mA 𝑉𝐶𝐸=5𝑉 (para dejar margen simétrico) 𝑉𝐵𝐸≈0.7𝑉 𝛽≈100 Configuración autopolarizacion con retroalimentación negativa. Objetivo: El propósito de esta sección es investigar el efecto de agregar retroalimentación negativa para estabilizar el punto de operación de CC. Preguntas: ¿Cómo ayuda la adición de retroalimentación negativa a estabilizar el punto de operación de CC?
387 days

flux

0:22

La retroalimentación negativa, aplicada mediante una resistencia en el emisor (por ejemplo), actúa de la siguiente manera:
  1. Compensación de variaciones: Si por alguna razón la corriente de colector aumenta, el voltaje en el emisor sube. Esto reduce la diferencia voltaje entre la base y el emisor (V_BE), lo que tiende a disminuir la corriente de base y, en consecuencia, la corriente de colector.
  2. Respuesta correctiva: De forma similar, si la corriente disminuye, el voltaje en el emisor baja, incrementando V_BE y favoreciendo un aumento en la corriente de colector.
  3. Estabilidad del punto de operación: Este mecanismo de autoajuste hace que el punto de operación sea menos sensible a las variaciones del transistor (como cambios en β) y a las fluctuaciones de temperatura, logrando una polarización más estable del circuito.
En resumen, la retroalimentación negativa actúa de forma correctiva, compensando las variaciones en la corriente y estabilizando el punto de operación del transistor en CC.
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