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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Notes
- 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.
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© 2011 Springer-Verlag Berlin Heidelberg
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Vogel, B. (2011). Noise in Bipolar Junction Transistors. In: The Sound of Silence. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19774-1_5
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DOI: https://doi.org/10.1007/978-3-642-19774-1_5
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