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Common-Collector Amplifier. Section 13.1-13.4. Topics. Emitter Follower as a power amplifier Push and Pull Output Stage. Design Guideline. Specs: Av, rsp, v_re gm=Av/(1-Av)/rsp Calculate IC from gm. Determine re from IC and V_RE Calculate VBE. Calculate VB. Calculate IB from IC.

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Presentation Transcript
Common collector amplifier

Common-Collector Amplifier

Section 13.1-13.4


Topics
Topics

  • Emitter Follower as a power amplifier

  • Push and Pull Output Stage


Design guideline
Design Guideline

  • Specs: Av, rsp, v_re

  • gm=Av/(1-Av)/rsp

  • Calculate IC from gm.

  • Determine re from IC and V_RE

  • Calculate VBE.

  • Calculate VB.

  • Calculate IB from IC.

  • Assume that I1=40 IB

  • Calculate R2 from VB.

  • Calcualte R1



V in m 1 mv
Vin, m=1 mV

Vin,pp=2 mV

Vout,pp=1.47 mV

Av(ADS)=0.735

Av(matlab)=0.783


Large signal behavior of common collector amplifier
Large Signal Behavior of Common-Collector Amplifier

The output does not track

the input during the negative swing.


V in m 1 71 v
Vin, m=1.71 V

VBE


Push pull stage
Push-Pull Stage

Q1 pushes current into RL.

Q1 and Q2 are off.

Q1 pulls current from RL.




V out versus v in
Vout Versus Vin



Vout versus vin1
Vout Versus Vin

Crossover

Distortion


Improved push pull stage
Improved Push-Pull Stage

Q1 and Q2 can not be

on at the same time!

V1=Vout+VBE1

V2=Vout-|VBE2|

Keep Q1 and Q2 on

V1-V2=VBE1+|VBE2|=VB



Implementation of vb
Implementation of VB

Add I1 to provide current

For D1 and D2.



Output stage with no dc shift
Output Stage with no DC shift

If I1=I2 and IB1 and IB2,

the input source

does not sink or source

Output voltage.


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