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Common Base (CB)

Common Base (CB). Input & Output Characteristics. Engr.Usman Ali Khan. Contents. CB, CE and CC CB Circuit CB Input Characteristics CB Output Characteristics. BJT Configurations. Common Base (CB) Common Emitter (CE) Common Collector (CC). Common Base (CB). E. C. Input. Output. B.

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Common Base (CB)

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  1. Common Base (CB) Input & Output Characteristics Engr.Usman Ali Khan

  2. Contents • CB, CE and CC • CB Circuit • CB Input Characteristics • CB Output Characteristics

  3. BJT Configurations • Common Base (CB) • Common Emitter (CE) • Common Collector (CC)

  4. Common Base (CB) E C Input Output B Base is common both to input signal and output signal

  5. Common Emitter (CE) C B Output Input E Emitter is common both to input signal and output signal

  6. Common Collector (CC) C Input B Output E Collector is common both to input signal and output signal

  7. CB Voltages and Currents NPN PNP C C IC IC B B IB IB E IE IE E VBE = 0.7 VEB = 0.7 VBE = -VEB

  8. CB Input Characteristics IE IC E C Output Side Input Side VBE VBC B To observe the behavior of Base-Emitter junction when VBC is fixed

  9. CB Input Characteristics IE VCB = 25V VCB = 10V VCB = 0V 0.7 VBE

  10. CB Output Characteristics IE IC E C Output Side Input Side VBE VBC B To observe the behavior of Base-Collector junction when IE is fixed

  11. CB Output Characteristics Break down Region or Punch Through Region (Depletion Regions Overlap) IC Active Region IE = 4mA IE = 3mA Saturation Region IE = 2mA Junction Forward Biased IE = 1mA Junction Reverse Biased VBC -1 0 5 10

  12. Home Work • Example: 4.2, 4.3 • End Problems: 4.6  4.7

  13. Common Emitter (CE) Input & Output Characteristics

  14. Contents • β • CE Configuration • CE Input Characteristics • CE Output Characteristics

  15. C IC VCB B IB VCE Output Input E VBE IE CE Configuration IE = IC + IB VCE = VCB + VBE VCE = VCB + 0.7 Input Current = IB Input Voltage = VBE Output Current = IC Output Voltage = VCE

  16. IC = 1mA IB = 10 µA β =?

  17. CE Input Characteristics IB VCE = 10V VCE = 20V 0.7 VBE

  18. CE Output Characteristics Break down Region or Punch Through Region (Depletion Regions Overlap) IC Active Region IB = 40 µ A IB = 30 µ A Saturation Region IB = 20 µ A IB = 10 µA Junction Reverse Biased VCE 5 10 15 20

  19. Home Work • CC Characteristics • Example: 4.4  4.6 • End Problems: 4.8  4.17

  20. Home task • Make CC(Common Collector) Configuration and draw input output characteristics…

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