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Bipolar Junction Transistor - BJT

Bipolar Junction Transistor - BJT. 1. Estrutura do BJT. 2. Fabricação do BJT. 3. Modos de operação 4. Conexões em circuitos. 5. Correntes no transistor bipolar. 6. BJT como amplificador de corrente. 7. Parâmetros do transistor α – Common base current gain β – Common emitter current gain

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Bipolar Junction Transistor - BJT

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  1. Bipolar Junction Transistor - BJT

  2. 1. Estrutura do BJT

  3. 2. Fabricação do BJT

  4. 3. Modos de operação 4. Conexões em circuitos

  5. 5. Correntes no transistor bipolar

  6. 6. BJT como amplificador de corrente

  7. 7. Parâmetros do transistor α – Common base current gain β – Common emitter current gain γ – Emitter injection efficiency δ – Base transport factor

  8. 9. Relações analíticas para as correntes

  9. 10. Corrente de recombinação na base

  10. 11. Modelo do Ebers-Moll

  11. Circuito equivalente do modelo do Ebers-Moll

  12. 12. Expressões para os parâmetros do transistor γ = IEp/IE– Emitter injection efficiency δ = ICp/IEp– Base transport factor α = γ.δ = ICp/IE– Common base current gain β = α/(1- α) – Common emitter current gain

  13. Limitações

  14. Aumento da corrente do coletor com VEC em regime ativo

  15. Multiplicação de portadores e ruptura

  16. Punchthrough

  17. Injeção baixa e ganho de corrente

  18. Injeção alta e efeito de Kirk na base

  19. Injeção alta na junção emissor-base

  20. Chaveamento do transistor

  21. Carga acumulada e tempo de transição

  22. Heterojunção e HBT

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