. Circuit theory of linear noisy networks. Electronic circuits; Amplifiers (Electronics); Noise. Conclusions The developments that we have undertaken have been rather lengthy. Therefore, it is worth while to reassess and summarize our principal re- sults as well as our omissions. As pointed out in the introduction, the original motivation for the present work was the desire to describe in a systematic manner the single- frequency noise performance of two-terminal-pair linear amplifiers. It was necessary at the outset to elect a criterion of noise performance, which we chose to be the signal-to
. Circuit theory of linear noisy networks. Electronic circuits; Amplifiers (Electronics); Noise. Conclusions The developments that we have undertaken have been rather lengthy. Therefore, it is worth while to reassess and summarize our principal re- sults as well as our omissions. As pointed out in the introduction, the original motivation for the present work was the desire to describe in a systematic manner the single- frequency noise performance of two-terminal-pair linear amplifiers. It was necessary at the outset to elect a criterion of noise performance, which we chose to be the signal-to-noise ratio achievable at high gain. This criterion is not clear for systems without gain, nor for multiterminal-pair networks. For multiterminal-pair networks, the noise parameter pT expressed in terms of the general circuit constants has been set down as an extension of the two-terminal-pair noise-measure definition but has not been given any physical interpretation in this work. One reason for this omission is the fact that a general-circuit-constant (or wave-matrix) description of multiterminal-pair systems has been of little use in the past. There have not been any systems incorporating gain whose noise per- formance on a multiterminal-pair basis was of interest. It is true that in the past some special problems involving frequency conversion have called for proper interpretations, and that two-terminal-pair networks processing sidebands may be analyzed theoretically as multiterminal-pair networks. But a sophisticated theoretical approach to noise problems of this nature was never necessary. Problems of this type were easily dis- posed of by inspection. Recently, parametric amplifiers (nonlinear-, or time-varying-, reactance amplifiers) have received a great deal of attention because of their low- 73. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations
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