Vs: Lateral mosfet vintage power amp?
Bipolaartransistori teemal:
Wikipeedia:
...That is, the collector current is approximately Beta times the base current.
Some basic circuits can be designed by assuming that the emitter-base voltage is approximately constant
and that collector current is beta times the base current.
However, to accurately and reliably design production BJT circuits,
the voltage-control (for example, Ebers-Moll) model is required.
Small Signal Audio Design:
There is one thing to get straight first:
The bipolar junction transistor is a voltage-operated device.
What counts is the base-emitter voltage, or Vbe.
Certainly a BJT needs base current to flow
for it to operate, but this is really an annoying
imperfection rather than the basis of operation.
I appreciate this may take some digesting; far too
many discussions of transistor action say
something like: "a small current flowing into the base
controls a much larger current flowing
into the collector". In fact the only truly
current-operated amplifying device that comes to
mind is the Hall-effect multiplier.
---------------------------------------
Baasivooluga kollektorivoolu tüürimine ei ole BJT fundamentaalne tööpõhimõte !
Sedasi ju töötab näiteks selline võimendusaste:
Transistor on U->I muundaja ja takisti Rc on I->U muundaja.
Üldine pingevõimendus:
-Gv=gm*rm.
Mõelge näiteks küllastuse tingimustele:
Ub>Ue, Ub>Uc
(Siin on veel tingimused Ub ei tohi ületada Uc ~0.6V ja Ub mitte üle Ue Ubeo võrra).
Bipolaartransistori teemal:
Wikipeedia:
...That is, the collector current is approximately Beta times the base current.
Some basic circuits can be designed by assuming that the emitter-base voltage is approximately constant
and that collector current is beta times the base current.
However, to accurately and reliably design production BJT circuits,
the voltage-control (for example, Ebers-Moll) model is required.
Small Signal Audio Design:
There is one thing to get straight first:
The bipolar junction transistor is a voltage-operated device.
What counts is the base-emitter voltage, or Vbe.
Certainly a BJT needs base current to flow
for it to operate, but this is really an annoying
imperfection rather than the basis of operation.
I appreciate this may take some digesting; far too
many discussions of transistor action say
something like: "a small current flowing into the base
controls a much larger current flowing
into the collector". In fact the only truly
current-operated amplifying device that comes to
mind is the Hall-effect multiplier.
---------------------------------------
Baasivooluga kollektorivoolu tüürimine ei ole BJT fundamentaalne tööpõhimõte !
Sedasi ju töötab näiteks selline võimendusaste:
Transistor on U->I muundaja ja takisti Rc on I->U muundaja.
Üldine pingevõimendus:
-Gv=gm*rm.
Mõelge näiteks küllastuse tingimustele:
Ub>Ue, Ub>Uc
(Siin on veel tingimused Ub ei tohi ületada Uc ~0.6V ja Ub mitte üle Ue Ubeo võrra).
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