Noise in Negative-Resistance Amplifiers
- 1 June 1960
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IRE Transactions on Circuit Theory
- Vol. 7 (2), 166-170
- https://doi.org/10.1109/tct.1960.1086655
Abstract
Negative-resistance amplifiers that consist of a noisy negative resistance imbedded in a lossless three-terminal-pair linear network to make a two-port amplifier are analyzed. It is shown that Haus and Adler's noise measureM_{e}, is not constrained to lie between two eigenvalues of a noise matrix, as is the case for bona fide two-port amplifiers. Instead, it is always equal to its optimum value, and is independent of the (lossless) imbedding network used. As a corollary of this, the noise figure of such an amplifier fails to equal its optimum value only insofar as the exchangeable gain is not high. The single value of noise measure may be computed from any simple lossless circuit at hand, or else from the exchangeable noise power of the noisy negative resistance.Keywords
This publication has 2 references indexed in Scilit:
- Circuit Theory of Linear Noisy NetworksPublished by MIT Press ,1959
- Correction to The Scattering Matrix in Network TheoryIRE Transactions on Circuit Theory, 1957