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ECE 340 ELECTRONICS I

ECE 340 ELECTRONICS I. BJT APPLICATIONS AND BIASING. V S. R 1. V X. R 1. V S. V X. R 2. R 2. SHORTHAND CIRCUIT DIAGRAM. BJT REGIONS OF OPERATION. CUTOFF ACTIVE OR LINEAR SATURATION. R C. V B. V C. V CC. R B. Q1. V BB. V E. R E. NPN BJT BIAS CIRCUIT ANALYSIS. I C. -V CB +.

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ECE 340 ELECTRONICS I

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  1. ECE 340ELECTRONICS I BJT APPLICATIONS AND BIASING

  2. VS R1 VX R1 VS VX R2 R2 SHORTHAND CIRCUIT DIAGRAM

  3. BJT REGIONS OF OPERATION • CUTOFF • ACTIVE OR LINEAR • SATURATION

  4. RC VB VC VCC RB Q1 VBB VE RE NPN BJT BIAS CIRCUIT ANALYSIS IC -VCB+ + VCE - IB + VBE - IE

  5. NPN INPUT CIRCUIT ANALYSIS

  6. NPN OUTPUT CIRCUIT ANALYSIS

  7. NPN DC VOLTAGES

  8. NPN REGIONS OF OPERATION

  9. NPN OPERATING LIMITS

  10. NPN OPERATING LIMITS

  11. RE VB VE VEE RB Q VBB VC RC PNP BIAS CIRCUIT ANALYSIS IE IB IC

  12. PNP INPUT CIRCUIT ANALYSIS

  13. PNP OUTPUT CIRCUIT ANALYSIS

  14. PNP DC VOLTAGES

  15. PNP REGIONS OF OPERATION

  16. PNP OPERATING LIMITS

  17. PNP OPERATING LIMITS

  18. VCC RB RC Q1 SINGLE RESISTOR BIASING CIRCUIT IC IB

  19. SINGLE RESISTOR BIASING • SETS BASE CURRENT • DIRECTLY CONTROLLED BY SUPPLY VOLTAGE

  20. INPUT KVL EQUATION

  21. INPUT LOAD LINE EQUATION

  22. COLLECTOR CURRENT DEPENDENCE ON VBE

  23. OUTPUT KVL EQUATION

  24. OUTPUT LOAD LINE EQUATION

  25. VCC RC R1 Q1 R2 RESISTOR DIVIDER BIASING CIRCUIT IC

  26. VOLTAGE DIVIDER BIASING • PROVIDES TWO METHODS OF DETERMINING BIAS CONDITIONS • SETS VBE VOLTAGE • SUPPRESSES DEPENDENCE ON β

  27. DIRECT METHOD • FIND THEVENIN CIRCUIT AT BASE NODE • CREATES INPUT CIRCUIT

  28. VCC RC RB Q1 VBB RESIDUAL CIRCUIT FROM THEVENIN CONVERSION IC IB

  29. INPUT EQUATION

  30. INPUT LOAD LINE EQUATION

  31. COLLECTOR CURRENT DEPENDANCE

  32. OUTPUT EQUATION

  33. OUTPUT EQUATION LOAD LINE

  34. INDIRECT OR APPROXIMATE METHOD • ASSUME IB≈ 0 • VBE IS SET BY VOLTAGE DIVIDER

  35. INPUT EQUATION

  36. ITERATIVE METHOD FOR CONVERGENCE

  37. ITERATIVE METHOD FOR CONVERGENCE • SUBSTITUTE VBE2 FOR VBE1 • CONTINUE ITERATION UNTIL VBEN+1≈ VBEN

  38. VCC RC R1 Q1 R2 RE VOLTAGE DIVIDER WITH EMITTER DEGENERATION

  39. VCC RC RB Q1 VBB RE RESULTANT CIRCUIT FROM THEVENIN CONVERSION

  40. INPUT EQUATION

  41. COLLECTOR CURRENT DEPENDENCE

  42. ITERATIVE METHOD

  43. ITERATIVE METHOD FOR CONVERGENCE • SUBSTITUTE VBE2 FOR VBE1 • CONTINUE ITERATION UNTIL VBEN+1≈ VBEN

  44. VCC RC RB Q1 SELF-BIASED CIRCUIT IB

  45. INPUT EQUATION

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