1. Input & Output Characteristics COMMON BASE (CB) Engr.Usman Ali Khan

2. CONTENTS 1.CB, CE and CC 2.CB Circuit 3.CB Input Characteristics 4.CB Output Characteristics

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

4. COMMON BASE (CB) InputOutput B EC Base is common both to input signal and output signal

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

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

7. CB VOLTAGES AND CURRENTS E C B E C B NPNPNP IBIB IEIE ICIC IBIB IEIE ICIC V BE = 0.7V EB = 0.7 V BE = -V EB

8. CB INPUT CHARACTERISTICS B EC V BE IEIE V BC ICIC Input Side Output Side To observe the behavior of Base-Emitter junction when V BC is fixed

9. CB INPUT CHARACTERISTICS V BE IEIE V CB = 0V V CB = 10V V CB = 25V 0.7

10. CB OUTPUT CHARACTERISTICS B EC V BE IEIE V BC ICIC Input Side Output Side To observe the behavior of Base-Collector junction when I E is fixed

11. CB OUTPUT CHARACTERISTICS V BC ICIC 0 510 I E = 1mA I E = 2mA I E = 3mA I E = 4mA Saturation Region Active Region Junction Forward Biased Junction Reverse Biased Break down Region or Punch Through Region (Depletion Regions Overlap)

12. HOME WORK Example: 4.2, 4.3 End Problems: 4.6  4.7

13. Input & Output Characteristics COMMON EMITTER (CE)

14. CONTENTS 1.β 2.CE Configuration 3.CE Input Characteristics 4.CE Output Characteristics

15. CE CONFIGURATION Input E C B Output V CE V CB V BE IBIB IEIE ICIC I E = I C + I B V CE = V CB + V BE V CE = V CB + 0.7 Input Current = I B Input Voltage = V BE Output Current = I C Output Voltage = V CE

16. I C = 1mA I B = 10 µA β =?

17. CE INPUT CHARACTERISTICS V BE IBIB V CE = 20V V CE = 10V 0.7

18. CE OUTPUT CHARACTERISTICS V CE ICIC 510 1520 I B = 10 µA I B = 20 µ A I B = 30 µ A I B = 40 µ A Saturation Region Active Region Junction Reverse Biased Break down Region or Punch Through Region (Depletion Regions Overlap)

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…