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Common-Base Amplifier. Common-Base Amplifier. Response of CB Stage to small Input Change. Input Impedance. Application of CB Stages. Response to a Source of Finite Source Resistance. Output Impedance. Input Impedance. General CB. (VA=infinity, RB>0).

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Presentation Transcript
general cb
General CB

(VA=infinity, RB>0)

Base resistance (RB) decreases voltage gain.

design goal
Design Goal

Goal: i2>>i1

bypass capacitor
Bypass Capacitor

(Base resistance decreases gain!)

design guideline
Design Guideline
  • Given: Rin, AV
  • Select RE>>(1/gm).
    • gm →IC.
    • RE=10Rin
  • Av=gmRC →RC
  • Vb=IERE+VBE
  • Let I(R1)=40IB →(R1+R2)
  • R2 is known from Vb and R1.
  • 1/(C1ω)=(1/gm)/20
  • 1/(beta+1)/(C1 ω)=(1/gm)/20