It is not traditional phase noise, and not a normal Nyquist filtering
problem, but, yes, presence of significant second harmonic energy in your
DDS output will shift/dither your squaring input.
It is hard, with practical filters and filter components to get much better
coverage than one-half octav
On Thu, 28 Jul 2016 23:39:24 + (UTC)
life speed via time-nuts wrote:
> The DDS tunes over more than an octave, so obviously the single low pass
> filter isn't going to cut it. I am noticing up to 3 dB phase noise
> degradation at the output of the divider as the DDS frequency decreases and
Hi,
Been a while since I visited, I recall there are many, well, time nuts here. I
am trying to track down a source of phase noise in a frequency synthesizer
design. One part of the frequency reference upconverts a DDS and then divides
it down again using a digital divider - standard techniqu
