Solid state tutorial

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dchisholm

dchisholm

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Joined 2011
DF96 said:
That article contains a few mistakes and minor confusions, so be careful. OK as a place to start from, but don't take it as absolute truth.
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That is a common problem for instructors who try to present fundamental concepts, without cluttering the explanation with subtleties, details, exceptions, etc.

Another example:
". . . Gain is a ratio, it has no units but is given the symbol "A" . . . "
​
Often true, especially when considering "gain" in a strictly mathematical sense. But even if you ignore the common use of decibel notation, engineers often scale gain values to, for example, "V/mV" or "V/uV". And then there are the cases where it's more informative to use concepts such as transconductance gain, with units of Siemens (or mhos) and symbolized as "gm".

And we haven't even begun to touch on the fact that "gain" has both magnitude and phase angle; and the "gain" value of practical circuits typically varies with frequency as well as signal level, etc, etc . . .

See what I mean about the challenges to an author who wants to present a basic concept?

Nevertheless . . . that web page is well organized and quite informative!

Dale
 
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