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Lecture 10

Lecture 10. Frequency response. topics. Bode diagram BJT’s Frequency response MOSFET Frequency response. Amplifier. Magnitude:. Phase:. Steady-state response. Magnitude:. Phase:. dB (decibel)= Decimal + Bell. Human hearing frequency zone : 10Hz~24kHz

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Lecture 10

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  1. Lecture 10 Frequency response

  2. topics • Bode diagram • BJT’s Frequency response • MOSFET Frequency response

  3. Amplifier Magnitude: Phase: Steady-state response Magnitude: Phase:

  4. dB (decibel)= Decimal + Bell Human hearing frequency zone : 10Hz~24kHz Most Sensitive frequency zone : 2kHz~5kHz

  5. Decade : Octave : Logarithmic coordinate dB Log scale

  6. Example(low pass)

  7. Magnitude: Phase:

  8. Example(high pass)

  9. Magnitude: Phase:

  10. The bandwidth represents the distance between the two points in the frequency domain where the signal is of the maximum signal strength.

  11. BJT high frequency model Splitting resistance (refinement the lumped-component circuit) Depletion capacitance Emitter-base capacitance = diffusion capacitance + Base-Emitter junction capacitance

  12. 3-dB frequency Low frequency ß

  13. Unity-gain bandwidth

  14. CE Amplifier

  15. Parallel capacitors Series capacitors Bandwidth Midband amplitude

  16. High frequency response: The effect of parallel capacitors

  17. Miller multiplier

  18. Example 5.18 Find the Midband gain and upper 3 dB frequency of CE amplifier. The parameters of Hybrid  model

  19. Low frequency response: The effects of the series capacitors

  20. Consider CC1

  21. Consider CE

  22. Consider CC2

  23. dominant

  24. Example 5.19 Find the CC1, CC2 and CE the CE amplifier of the example 5.18.

  25. MOSFET high frequency model

  26. High frequency response: The effect of parallel capacitors

  27. Bandwidth Midband amplitude

  28. Example 4.12 Find the Midband gain and upper 3 dB frequency of CS amplifier.

  29. Low frequency response: The effects of the series capacitors

  30. Example 4.13 Find the CC1, CC2 and Cs the CS amplifier of the example 4.12.

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