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Optimum Conditions for Maximum Power in Class A Amplifiers

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1 Author(s)
Nottingham, Wayne B. ; George Eastman Laboratory of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts

By following a simple analysis, it is shown that there are three cases for which optimum operating conditions may be established for class A amplifiers. These are for (I) the small signal, (II) the fixed quiescent plate voltage, and (III) the fixed quiescent plate dissipation. There is a "best" operating condition, which might be considered as a fourth case, if both the quiescent plate voltage and the quiescent plate dissipation are fixed. For cases (I) and (II) the results are definite and give R=rpand R=2rpbut for (III) R=20rpand for the fourth condition R=8rp. In the last two conditions R is not exactly the same for all tube types but depends to some extent on the tube characteristic. The undistorted power delivered to the load for these cases varies by a factor of nearly 3.

Published in:

Proceedings of the IRE  (Volume:29 ,  Issue: 12 )