power amp driver block topology?

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mikek

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Joined 2002
Bricolo said:



After many advices, I am decided to buy my 1st book about electronics: "the art of electronics" by Horowitz and Hill.
It's an expensive one (75$), so I won't buy dozens of books for the momment ;)
Does it deal about noise? Or will I have to buy the one you told me too?
Click to expand...


Horowitz deals with noise...so don't buy Mochenbacher...just yet...:)
 
J

jcarr

Member
Joined 2002
lyraconnoisseur.com/
C

Christer

Member
Joined 2002
Documents on noise from the noise on the net

I am not sure if there were anyone else than jam, Bricolo and
me being interested in the noise theory and the question John
challenged us with, but for those of us who are interested and
didn't already know all about it I went hunting on the net and,
contrary to my previous attempts, managed to find some good
documents on amplifier and semiconductor noise. So those
who wish to learn more about the basic theory may find some
of the following documents helpful:

http://www.national.com/an/AN/AN-104.pdf
(deals with noise on amplifier level and defines the basic
theory needed for this)

http://www.eie.polyu.edu.hk/~ensurya/lect_notes/commun_cir/Ch3/Chapter3.htm
(defines and discusses noise sources in semiconductor devices)

http://www.teicontrols.com/notes/ElectronicCircuitsIIEE338K/ElectronicCircuitsII.pdf
(actually a compilation of diagrams and formulae on various
things, but also briefly defines the basic types of noise.)

http://www.teicontrols.com/notes/ElectronicCircuitsIIEE338K/NoiseReferral.pdf
(Another document discussing referral of noise sources to the
input, also covered in the National app note).


These documents resolve some of my previous confusion, at
least, since I falsely assumed it would be possible to arrive at
an answer to Johns question from the info he gave us. I now
realize he probably didn't mean that, since it seems we have
to make assumptions about the load resistance/impedance in
the two cases to be able to do a noise referral.

I also wasn't sure if the theory John presented dealt also with
burst and flicker noise. Checking with these documents shows
that not to be the case. An interesting question is thus whether
these noise mechanisms must also be considered or if they
can be ignored for audio purposes? One paper actually claims
burst noise to often be the dominant factor in JFETs and flicker
noise in MOSFETs.

Finally, I'd like to say that Johns question, and especially the
follow-up question, show great pedagogical insight. Thanks
for bothering about it.
 
john curl

john curl

Member
Joined 2003
It has been my interest to bring some of you up to date on how noise is generated in solid state components. I deliberately left out additional stages and 1/f, as well as popcorn noise, because they are relatively low in good quality parts at audio frequencies. RF, or test instrumentation, could be another matter entirely. Many of the contributions and references have been as good as I have seen anywhere. It is pointless to make a noisy circuit, if it can be avoided with a little knowledge of what is important. One thing that I often see is a relatively large resistor, (over 100 ohms) in series with many preamps. This can be good for RF control, but it can add significant noise to a phono stage, unnecessarily.
 
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