How about the chip AD539 ? would that work in this application. I
looked at the PPL link (above) but the input to that was a digital
square wave...I am looking the input to me an Analog Sine Wave @ 30Khz
5 Vp-p. My main goal is to have the second wave coming out of the
AD539 (or whatever chip/circuit) to be phase with the orginal sine
wave coming out of the osscilator.
Diagram:
Ossiclattor ----------sine wave 30Khz 5 vp-p---->
(from ossiclator) -----Multiplier ---- = N*30Khz --->
(needs to be
in phase)
I am just concern with gettting that sine wave out of the muliplier to
be in phase. woudl the AD539 or the AD532 work?
The AD539 is a "voltage multiplier", not a "frequency multiplier".
In other words you are chasing a red herring.
A phase-locked loop frequency multiplier is by definition locked
in phase with the input signal. Different phase comparator block choices
will give you different phase shifts between the input and output. Start
with the MC4046 data sheet if you are interested and your textbooks
don't talk about phase comparators. Most VCO's don't make good sine
waves (there are exceptions, but most applications don't care enough
to go to the trouble so I'm very dubious that you'd go to the same
trouble.)
This is all of dubious value, because you do not need nor want a
PLL for simple FSK modulation. Once you add in phase shift keying
then product modulators (aka voltage multipliers) like the AD539 become
useful for demodulation, but you're asking all the wrong questions if
that's what you are chasing after.
Tim.
