Inverted Shunt Regulator - Tube CAD Journal

January 2001 ^^ TUBE CAD JOURNAL ^^
Volume 3 Number 1 >>
Let's add the lack of true complementary P
and N channel devices. Still, are transistors any
better? Once again, better for what? If a solidstate
uses global feedback, the transistor wins
easily. Why? Because it has much greater
transconductance, which means more gain,
which means more feedback. On the other hand,
if the amplifier is feedback free, the MOSFET
probably wins, as its static transfer function is
straighter. Still only a little emitter degeneration
across a small valued resistor performs wonders
in straightening out the transistor.
I wish some company would look into
bringing out the Gridister or the Lateral Punch
Through Transistor. Or maybe we can make a
compound device out of existing devices. One
such circuit is shown below.
Is it a bird, a plane, a MOSFET, or a triode
The circuit shown above is not efficient, but it
may sound great. By selecting the right resistor
values, we select the rp and Gm of the circuit
Hybrid power amplifiers is a topic that is ripe
for an article or two in this journal. Singleended
and push-pull hybrid amplifiers might be
the best compromise when a budget is tight.
Who knows? It might also be the best
compromise period. Let's see what the next
issue brings.