Common-Collector Amplifier

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Common-Collector Amplifier Section Topics Emitter Follower as a power amplifier Push and Pull Output Stage.

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Presentation transcript:

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. Assume that I1=40 IB Calculate R2 from VB. Calcualte R1

Common-Collector Amplifier

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 The output does not track the input during the negative swing.

Vin, m=1.71 V VBE

Push-Pull Stage Q1 pushes current into RL. Q1 and Q2 are off. Q1 pulls current from RL.

Vout versus Vin

DC Sweep

Vout Versus Vin

Transient Simulation

Vout Versus Vin Crossover Distortion

Improved Push-Pull Stage Q1 and Q2 can not be on at the same time! Keep Q1 and Q2 on V1=Vout+VBE1 V2=Vout-|VBE2| V1-V2=VBE1+|VBE2|=VB

Example 13.5

Implementation of VB Add I1 to provide current For D1 and D2.

Current flowing through the Source

Output Stage with no DC shift If I1=I2 and IB1 and IB2, the input source does not sink or source Output voltage.