<sigh>
LOL and around we go again
<sigh>
LOL and around we go again
I think I brought up some new points, and I am willing to defend them.
Ratch
Hows about we discuss common-base RF linear power amplifiers? Those are pretty cool. And you can show off your acumen concerning decibel power-gain computations! I could use a little education in this area too.
Merry Christmas, each and every one of you. I am in Virginia Beach with a house-full of grand children until Friday, but will keep an eye on the forum anyway.
Can you say "Hopelessly ironic"?That would be off topic with respect to this thread ...
Stay there Hevans, its sounds safer than this thread right nowHows about we discuss common-base RF linear power amplifiers? Those are pretty cool. And you can show off your acumen concerning decibel power-gain computations! I could use a little education in this area too.
Merry Christmas, each and every one of you. I am in Virginia Beach with a house-full of grandchildren until Friday, but will keep an eye on the forum anyway.
Gee, someone tell the cell phone manufacturers, who have been using GaAs heterojunction BJT power transistors for quite some time now. I used to do ion implant isolation on gallium arsenide wafers patterned with thousands of 'em as microwave RF power integrated circuits (MMICs}.... I don't think a BJT is the best device for RF amplifiers.
Did you not notice that electronics experimenters sometimes gather here? We do build things... just for fun, mostly.Some companies make good off the shelf amplifiers for that kind of thing that are easier and probably cheaper than you can do from scratch.
Gee, someone tell the cell phone manufacturers, who have been using GaAs heterojunction BJT power transistors for quite some time now. I used to do ion implant isolation on gallium arsenide wafers patterned with thousands of 'em as microwave RF power integrated circuits (MMICs}.
Not only from physics! It is not a problem to show by test&measurement that it is the voltage Vbe only that determines the current Ic (see my reply#17)So how do we know that a BJT is a transconductance device? We know from its physics, not by any one of many models that can be conjured up.
Ratch
Where is the current control?
Um, the equation for Ib in terms of Ic perhaps?
To me, voltage control would mean that Ic would be related to Vbe in some equation. None of Adams equations does that.
Bob
In order to make the transistor work, a current is injected into the base with the expectation of a current gain at the collector. The base current causes a voltage to appear across the base-emitter junction, but the actual value of Vbe is unimportant except that it is equivalent to one diode voltage drop. The simple physical reality is that in order to make the transistor work, a current is injected into the base to control the current at the collector. That is why the transistor works as a current amplifier.