Been off-line for a bit. WEB acess went kaput.
Anyway, here's where I left:
so whats all this about DC on AC bias
Let's try this. And it's generally an
AC signal on (or with) a
DC bias.
Let's say your 6' tall. There's a 6' door in front of you that is also 6' tall.
Except that the bottom of the door is 3' off the ground (Gnd).
You walk towards it but cannot get in because you're lower half is 3' below the bottom on the door. Your upper portion could get in, but your lower portion would be blocked and left behind.
Now let's say we can apply a
gravitational bias that elevates you 3'
above the ground (Gnd).
Now as you walk forward ALL of you can pass through the door just fine.
The same thing happens in a circuit. A signal (sine wave, for instance) might not
ALL get through a circuit (an amplifier, for example) because a portion of that signal "swings" below ground (Gnd, or zero potential). By elevating the entire signal (biasing it) with a DC potential great enough to get ALL PORTIONS of the signal above ground (Gnd) allows
all of the signal to get through and be amplified.
And, of course, there are other uses for biasing, but for starters, this is one use.
Make sense?? (Did to me when I wrote a few hours ago. Still sorta does...)
KISS: Yeah, they're pretty proud of their stuff...
Give me a little bit to catch up.