Frequency-Modulation: Theory of the Feedback Receiving Circuit
John R. Carson · Bell System Technical Journal · 1939
THIS paper may be regarded both as a continuation of a prior one by the writer and Thornton C. Fry1and as a companion of that by J. G. Chaffee 2 the inventor of the circuit under consideration. For an understanding of the present, an acquaintance with the prior paper1is absolutely necessary, since the fundamental analysis and the formulas there developed are too lengthy to be repeated here. References to that paper will be designated by (Ref.).