Date of Award
Master of Science
J. F. Pierce
J. W. Waller, Lida K. Barnett
The analysis of the White emitter-follower, indicated that this circuit exhibits definite advantages over the the conventional emitter-follower in four areas: gain, input impedance, output impedance, and amplification of bipolar pulses. The feedback in the White emitter-follower accounts for he advantages.
A major disadvantage of the emitter-follower is the variation in beta, for large collector current swings, which results in unequal amplification of bipolar pulses. It has been shown that the White emitter-follower does not exhibit this non-linear beta characteristic due to the compensation of the feedback loop. A decrease in beta in the White emitter-follower will result in an increase in the driving signal, Vbel' which will tend to compensate for he beta reduction. The feedback yields an effective linear beta not possible in the emitter-follower configuration. Therefore, the White emitter-follower is able to amplify bipolar pulses with approximately equal amplitudes.
Finch, William Parker, "Analysis of The White Emitter-Follower Amplifier. " Master's Thesis, University of Tennessee, 1965.