The Limitations of Resistance Coupled Amplification

It is demonstrated that the frequency response curve of a resistance coupled amplifier is identical to that of an idealized tuned amplifier. Certain theoretical limitations on the stage gain and the band of frequencies amplified are derived, and the practical limitations are estimated. The use of a pliodynatron as a resistance coupled amplifier in order to overcome certain of the limitations is suggested. Curves and formulas are presented which will aid in the design of amplifiers by Luck's method. Analogous formulas for tuned amplifiers are derived.