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# Common-Collector Amplifier - PowerPoint PPT Presentation

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

Section 13.1-13.4

• Emitter Follower as a power amplifier

• Push and Pull Output Stage

• 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

Vin, m=1 mV

Vin,pp=2 mV

Vout,pp=1.47 mV

Av(matlab)=0.783

The output does not track

the input during the negative swing.

Vin, m=1.71 V

VBE

Q1 pushes current into RL.

Q1 and Q2 are off.

Q1 pulls current from RL.

Vout Versus Vin

Crossover

Distortion

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

Add I1 to provide current

For D1 and D2.

If I1=I2 and IB1 and IB2,

the input source

does not sink or source

Output voltage.