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Bipolar Junction Transistors (BJTs)

Bipolar Junction Transistors (BJTs). Bipolar. Two. Polarity. Transistor. Resistor. Tranfer. +. Types of BJTs. NPN PNP. p-type. n-type. n-type. NPN-BJT Structure. C. B. E. NPN BJT Symbol. n-type. p-type. p-type. PNP-BJT Structure. C. B. E. PNP BJT Symbol.

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Bipolar Junction Transistors (BJTs)

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  1. Bipolar Junction Transistors (BJTs) Bipolar Two Polarity Transistor Resistor Tranfer +

  2. Types of BJTs • NPN • PNP

  3. p-type n-type n-type NPN-BJT Structure

  4. C B E NPN BJT Symbol

  5. n-type p-type p-type PNP-BJT Structure

  6. C B E PNP BJT Symbol • Emitter is reversed

  7. E Base (p-type) C Emitter (n-type) Collector (n-type) B Current Flow Convention IE IC IB

  8. WorkING

  9. BJT structure note: this is a current of electrons (npn case) and so the conventional current flows from collector to emitter.

  10. Transistor Connections • Common Base Connection • Common Collector Connection • Common Emitter Conncetion

  11. Common Base Connection

  12. Current Amplification Factor α =IC / IE ( constant VCB) • The value of α is lies b/w 0.9 to 0.999 • Total collector current • IC=αIE+Ileakage

  13. Common Collector Connection

  14. Current Amplification Factor • γ = IE/IB • Expression for collector current. • IC= IB /1-α+ ICBO /1-α

  15. Common Emitter Conncetion

  16. Base Current Amplification Factor • β= IC / IB • The range of β is 20 to 500. • Expression for collector current. • IC= βIB + ICEO

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