Hi,
On 07/25/2015 03:35 AM, Charles Steinmetz wrote:
skipp wrote:
[the 10MHz output is] not even close to being symmetrical. The waveform
on-portion (duty cycle) appears (surprising to me) to be much less
than 20%
Now I'm under the assumption that proper rounding or conversion of the
non
symmetrical 10 MHz square to a sine wave will be a bit more involved.
That means there are significant even harmonics present, including the
second harmonic, which is a lot closer to the fundamental and,
therefore, harder to remove by filtering (a perfect square wave contains
only the fundamental and its odd harmonics).
If the symmetry error is minor, the second harmonic at 20 MHz will still
be relatively small. However, it if turns out to be important, an
LCR-serial link tuned to 20 MHz and with some resistance for
sufficiently low Q can eat some of that energy up as it is placed
between signal and ground.
Cheers,
Magnus
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