Common-Collector Amplifier Section 13.1-13.4

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.

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

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

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

Apply a small Signal (Vpp=30 mV) VB1/VS Matlab --11.17 ADS -8.266 Measurement -8

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

Typical Audio Signal Limited output Swing

Audio Plug

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

Power Dissipation of the Current Source

Efficiency

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

Improved Push-Pull Stage

DC Bias

Voltage Gain

Output Impedance