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BJT α and β

  • From the previous figure

  • Define α =

  • Define β =

  • Then β =

(

) = α /(1- α)

  • Then

α

;

( α)

  • Typically β ≈ 100 for small signal BJTs (BJTs that

handle low power) operating in active region (region where BJTs work as amplifiers)

5

BJT in Active Region

Common Emitter(CE) Connection

  • Called CE because emitter is common to both VBB

and VCC

6

3

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