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Common-Collector Amplifier

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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  1. Common-Collector Amplifier Section 13.1-13.4

  2. Topics • Emitter Follower as a power amplifier • Push and Pull Output Stage

  3. 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

  4. Common-Collector Amplifier

  5. Vin, m=1 mV Vin,pp=2 mV Vout,pp=1.47 mV Av(ADS)=0.735 Av(matlab)=0.783

  6. Large Signal Behavior of Common-Collector Amplifier The output does not track the input during the negative swing.

  7. Vin, m=1.71 V VBE

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

  9. Vout versus Vin

  10. DC Sweep

  11. Vout Versus Vin

  12. Transient Simulation

  13. Vout Versus Vin Crossover Distortion

  14. 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

  15. Example 13.5

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

  17. Current flowing through the Source

  18. 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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