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JFET

JFET. Bollen. JFET Overview JFET vs BJT Physical structure Working Input parameters DC formula Output parameters Transconductance Ac parameters Simulatioin parameters micro cap. JFET Fixed bias Self bias Voltage divider bias MOSTFET Component DC ac. AGENDA. Bollen. FET =

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JFET

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  1. JFET Bollen

  2. JFET Overview JFET vs BJT Physical structure Working Input parameters DC formula Output parameters Transconductance Ac parameters Simulatioin parameters micro cap JFET Fixed bias Self bias Voltage divider bias MOSTFET Component DC ac AGENDA Bollen

  3. FET = Field Effect Transistor N-channel or P-channel J-FET Bollen

  4. J-FET, OVERVIEW Bollen

  5. JFET vs BJT Bollen

  6. J-FET vs BJT Bollen

  7. Physical structure There is one PN junction from gate to channel used in REVERSE Bollen

  8. JFET working Bollen

  9. JFET working Bollen

  10. Vp and Idss In data sheet p = pinch-off dss = drain source shorted or saturated = maximum current JFET input parameters Bollen

  11. JFET DC formula Solve with abc formula Bollen

  12. JFET Output parameters Uds < Up = ohmic region, Uds > Up = saturated region Bollen

  13. JFET JFET is not often used in the ohmic (triode) region If so it is used as an variable resistor Bollen

  14. JFET output Bollen

  15. JFET output Bollen

  16. JFET transconductance Bollen

  17. JFET transconductance Bollen

  18. JFET ac parameters Bollen

  19. JFET simulation parameters micro cap VTO Threshold voltage BETA Transconductance parameter Bollen

  20. JFET fixed bias Steady Ugs, no variation possible, so we make the same effect with resistors. U = I . R Now we can vary around the bias point Bollen

  21. JFET self bias Ug = 0 volt, NO gate current Ugs = Ug – Us = 0 – Ids.Rs Rin = 1 Meg Ohm Bollen

  22. JFET self bias Varying Rs = varying the Q-point = operating point Bollen

  23. Ug  0 volt Ugs = Ug – Us = Vg – Ids.Rs, bias is made at GATE and SOURCE JFET voltage divider bias Bollen

  24. Metal Oxide Silicium Field Effect Transistor MOSFET Bollen

  25. MOSFET Bollen

  26. MOSFET Bollen

  27. MOSFET dc Bollen

  28. MOSFET ac Bollen

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