1. Common-Collector Amplifier
Section

2. A note about Human Ear Human can hear between 12 Hz and 20 KHz.
The range begins to shrink at the age of 8 with high frequency fading.

3. Vs,pp=100 mV, Freq=1 KHz VB1/VS Matlab 0.7304 ADS 0.73 Measurement
0.734

4. Vs,pp=100 mV, Freq=1 KHz mV VB2/VS Matlab -13.963 ADS -14.9
Measurement
-14

5. Vs,pp=100 mV Slight mismatch Bias current of Q2=13 mA
13 mA x 8 Ohms=104 mV

6. Apply a small Signal (Vpp=30 mV)
VB1/VS
Matlab
ADS
-8.266
Measurement -8

7. Increase the Input Frequency
Vout/Vs
1 K -8
1 MHz
-7.21
2 MHz
-5.26
3 MHz
-4.32
3dB BW=1.9 MHz

8. Typical Audio Signal
Limited output
Swing

9. Audio Plug

11. Power Dissipation of Q1 Assumption: The instantaneous power
dissipated by Q1:ICVCE
Average Power

12. Power Dissipation of the Current Source

13. Efficiency

14. Efficiency of Emitter Follower
Pdiss of Q1:
Pdiss of I1:
Total power wasted in Q1 and I1:
Output power:

15. Improved Push-Pull Stage

16. DC Bias

17. Voltage Gain

18. Output Impedance