Common collector amplifier
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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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Common-Collector Amplifier

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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


Common collector amplifier1

Common-Collector Amplifier


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.


Vout versus vin

Vout versus Vin


Dc sweep

DC Sweep


V out versus v in

Vout Versus Vin


Transient simulation

Transient Simulation


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


Example 13 5

Example 13.5


Implementation of vb

Implementation of VB

Add I1 to provide current

For D1 and D2.


Current flowing through the source

Current flowing through the Source


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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