NDLI: Noise in transistor mixers

Content Provider	IEEE Xplore Digital Library
Author	Vogel, J.S. Strutt, M.J.O.
Copyright Year	1963
Abstract	Starting from the physical sources of noise in junction transistors, an equivalent noise circuit for a high frequency mixer circuit is presented. By means of formulas which have been derived for normal amplifiers and mixers the noise current components in the collector circuit are computed. These noise current components at the intermediate frequency are due to diverse amplifying and mixing processes. The dependence of the derived noise factor upon working point, generator output resistance, frequency and oscillator voltage is verified. The noise figure exhibits a minimum not only as a function of the generator output resistance but also as a function of the collector direct current. The noise figure may be optimized by choosing appropriate values for the circuit components and the operating point. Finally, the application of the noise formula to a dc-stabilized mixer stage is presented.
Sponsorship	IEEE Publication
Starting Page	340
Ending Page	349
Page Count	10
File Size	891899
File Format	PDF
ISSN	00189219
Volume Number	51
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1963-02-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circuit noise Semiconductor device noise Noise figure Noise generators Voltage-controlled oscillators Frequency response Cutoff frequency Equivalent circuits Diodes Random processes
Content Type	Text
Resource Type	Article
Subject	Computer Science Electrical and Electronic Engineering

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