modified 9 years ago

LAoE 4L.4 Common-emitter amplifier

01:22:22

- What is the voltage gain? 
⦿ A=18.9 (from DC analysis)

- Where is the f3db point? 
⦿ f3db = 112Hz (from AC analysis)
   Calculating imput impedance from f3db:
  f3db = 1/(2π⋅Rin⋅C)
  112=1/(2π⋅Rin⋅333⋅10⁻⁹)  
  Rin ≈ 4267.34Ω 

- What should the output impedance be?
  Check it by connecting a resistive load 7.5KΩ - using a blocking capacitor

⦿The amplitude of the output signal halves when the 7.5KΩ load is connected, so the output impedance is about 7.5KΩ

published 9 years ago

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