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Published in:
Amps, Pre-amps, Pre-pre-amps Read chapter Read first chapter

2011 | OriginalPaper | Chapter

5. Noise in Bipolar Junction Transistors

Author : Dipl.-Ing. Burkhard Vogel

Published in: The Sound of Silence

Publisher: Springer Berlin Heidelberg

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Abstract

The circuit of Fig. 4.1 becomes a bit more complex when dealing with a real life amplifier and with a transistor as the first amplifying stage. In most cases, the noise production of FETs or valves becomes higher than that of Bipolar Junction Transistors (BJTs). Therefore, we have to dive rather deep into the noise making elements of BJTs. I do not discuss all the theories of modelling transistors. This can be done by studying some other publications After many trials, I found out that the adapted model for audio frequencies of Fig. 5.2 is very useful for practical noise calculations. For the audio band, it is derived from the so-called π-model that is given in Fig. 5.1.

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previous chapter Noise in Components and Other General Noise Effects
next chapter Noise in Field Effect Transistors
Footnotes
1
“Noise in transistor circuits”, Baxandall, EW 11&12-1968.
 
2
T/S and M/C.
 
3
“Designing low-noise audio amplifiers”, Wilfried Adam, EW June 1989.
 
4
E.g. D/S in “Self on Audio” or in “Small Signal Audio Design”.
 
5
T/S, Chap. 4.
 
6
“Design of MC head amplifiers”, D/S, EW 12-1987.
 
7
T/S Sect. 4.2.
 
8
Tom McCormick 1992 in a letter to Wilfrid Adam – as a follow-up of Mr Adams 1989 EW article on “Designing low-noise audio amplifiers”.
 
Metadata
Title
Noise in Bipolar Junction Transistors
Author
Dipl.-Ing. Burkhard Vogel
Copyright Year
2011
Publisher
Springer Berlin Heidelberg
Book
The Sound of Silence

Print ISBN: 978-3-642-19773-4

Electronic ISBN: 978-3-642-19774-1

Copyright Year: 2011

DOI
https://doi.org/10.1007/978-3-642-19774-1_5