1/20 This is a long shot, but can anyone tell me how a frequency
divider circuit works? Assume I have a voltage v(t) = cos(2wt).
How would I build a circuit that outputs cos(wt)? By the way,
this isn't homework; I was curious but couldn't find it on the
net or in my old EE textbooks. I know how to double a frequency
by squaring and filtering, but how to do a divider eludes me.
\_ idiot way - convert the sine wave into a square wave, attach
the result to the clock of a flip flop, insert an inverter
loopback into the flip flop, buffer the output of the flip
flop, and attach a capacitor to the output of the buffer.
also known as the rube goldberg (however you spell it) solution.
\_ squaring and removing DC only works on sinusoidal signals.
a non-causal solution is trivial, but
if you want caual and works only with sinusoids, use a PLL
or use the fact that sin^2(u/2) = (1-cosu)/2, and somehow put
the sign back in after square rooting. homeboy's solution above
is just as elegant.
noone deals with sine waves any more dude. -ali.
\_ you're an idiot. i suppose you think the carrier signals
on the 10 GHz irridium phones are TTL pulses, and that
the engineers who designed them are all digital monkeys
like yourself? I know guys who are running mixers at over
a terahertz; do you think they designed those by clever use
of digital circuits?
-physicist sick of ignorant EE students
\_ If digital monkeys bug you so much, get the hell off of
soda and start your own party on the s00per analog
computer you've got back at the lab, physics-boy. You're
just bitter because physicists, as a group, have to be the
only set of people with worse hygiene and poorer social
skills than EECS majors.
\_ Math grad students are fighting for pride-of-place at
the bottom of the list, too! |
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