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Chap 3

Chap 3. Simple Diode I-V Representation. V ON = 0.7v. Ideal. R Leak. R ON =ohms. Diode Symbols and Ckt Representation. Diode SPICE parameters. Simple Diode Rectifer. R Leak. R on =RS =10 ohms. Limiters/Clippers. R Leak. 10V. -8V. Limiters/Clippers Con’t Zeners. V  +V Z. V Z.

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Chap 3

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  1. Chap 3

  2. Simple Diode I-V Representation VON = 0.7v Ideal RLeak RON =ohms

  3. Diode Symbols and Ckt Representation

  4. Diode SPICE parameters

  5. Simple Diode Rectifer RLeak Ron =RS =10 ohms

  6. Limiters/Clippers RLeak 10V -8V

  7. Limiters/Clippers Con’t Zeners V+VZ VZ -V-VZ VZ 3.3V -VZ 3.3V+VZ Vo = RDiode Vin/(RDiode+R)

  8. LOG COMPUTATION AND THE DIODE

  9. COMPUTATION AND THE DIODE

  10. Basic Semiconductor Concepts-Review

  11. Basic Semiconductor Concepts

  12. Doping Example

  13. Diffusion

  14. Drift

  15. Open Ckt pn Junction

  16. Open Ckt pn Junction

  17. Rev. pn Junction-Depletion Cap.

  18. Reverse Bias pn Junction

  19. Fwd. pn Junction on the Small Signal

  20. Fwd. pn Junction-Diffusion Cap.

  21. Small Signal vs Large Signal

  22. DC vs AC (Small signal)

  23. Zener Regulation Supplemental Material

  24. Full Wave Rectifier Supplemental Material

  25. Full Wave Rectifier

  26. Voltage Doubler/Clamped Cap

  27. RFID Doublers

  28. RFID Doublers |RS + jXCB | < |20xRL + JXCL| “Short Ckt”

  29. RFID Doublers

  30. RFID Doublers

  31. RFID Doublers

  32. Diode Switching Supplemental Material

  33. Diode Summary Forward bias: Initially Qp is zero,all If goes to dQp/dt In steady state , Supplemental Material Charge Storage: The process of excess charge removal to undo the charge just built up. Until the removal of Qp is complete, diode will continue to remain on with Vd  0.7V.

  34. Diode Summary Cuttoff: During this transient no substantial amount of excess holes is built up. id = dQj/dt. The applied current goes to charge Cj .A simple first order circuit. Charging of Cj is confirmed by the spike in the current. Supplemental Material

  35. Diode Summary Neagtive Ir should confirm Charge at time t is given by Supplemental Material

  36. Diode Summary Reverse recovery: All of Qp has been swept , and the diode is back at the edge of conduction. Retraces its initial turn on transient , but in reverse direction. Id is negative , but is still governed by Supplemental Material

  37. Diode SPICE parameters

  38. Diode Summary

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