1. Common-Collector Amplifier
Section 5.3

2. Topics Emitter Follower Core Effect of Transistor Output Resistance
Emitter Follower with Biasing

3. Voltage Gain of Emitter Follower

4. Use a current source to implement RE
RE=infinity imples that AV=1

5. Thinking of an Emitter follower as a voltage divider

6. Source Resistance Included

7. Input Resistance

8. Output Resistance
RS is transformed to a smaller output resistance.

9. Application of Common Collector Stage
Av=-(RC||Rsp)/(1/gm)
RSP=8 Ohms << RC
AV=-RSP/(1/gm)

10. Interpose a Emitter Follower between the CE Stage and the speaker
CE stage: -(RC||Rin1)/(1/gm)

11. Inclusion of Output Resistance

12. 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

13. Common-Collector Amplifier

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

15. Vin, m=1.71 V
Need to adjust V_RE.