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BIPOLAR JUNCTION TRANSISTORS (BJTs)

BIPOLAR JUNCTION TRANSISTORS (BJTs). have considered the junction diode - basic 2-terminal device now consider the 3-terminal device - much more useful 3-terminal device: use voltage between 2 terminals so as to control the current in the 3rd terminal. 3-terminal devices .

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BIPOLAR JUNCTION TRANSISTORS (BJTs)

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  1. BIPOLAR JUNCTION TRANSISTORS (BJTs) • have considered the junction diode - basic 2-terminal device • now consider the 3-terminal device - much more useful • 3-terminal device: use voltage between 2 terminals so as to control the current in the 3rd terminal chpt 4

  2. 3-terminal devices • 2 major types : - bipolar junction transistors (BJTs) (chpt. 4) - field-effect transistors (FETs) (chpt. 5) chpt 4

  3. Physical Structure of BJT • 3 semiconductor regions: - emitter (n) - base (p) - collector (n) = ‘npn’ transistor chpt 4

  4. npn - transistor modes • BJT modes chpt 4

  5. npn in ACTIVE MODE- current flow chpt 4

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