22 Aug
2008
22 Aug
'08
1:28 a.m.
der Mouse wrote:
Yes, there is that distinction, but by the time you put both into full circuits
with current limiting resistors for the bipolar trans and bias resistors for
the tubes, where there is current there is voltage drop and where there is
voltage there is current flow, so I wouldn't characterise it as the primary
distinction.
The structural/configuration difference between the two is more significant, if
one looks at schematics of the two gate designs.
It is not simply a swap of transistors for vacuum
tubes, they are
fundamentally different approaches to gate design, at least if we're
talking about the common families of RTL ICs (that I've seen internal
schematics for).
Well, for one thing, isn't RTL generally bipolar junction transistors?
Vacuum tubes are operationally more like FETs than they are like BJTs.
(A BJT is current control, current output, whereas a FET or vacuum tube
is voltage control, current output.)