[time-nuts] 5>10 doubler
Charles Steinmetz
csteinmetz at yandex.com
Wed Feb 4 21:11:27 UTC 2015
Andrea wrote:
>Can you put in another graph the calculated difference to a pure sine wave?
I'm not sure what you mean by "the calculated difference to a pure
sine wave." I already reported the amplitudes of all of the visible
spurs (that is, the ones above the simulation noise floor), which
define the departure from a pure 10MHz sine wave. I am attaching
below the simulated spectrum analysis from which I took those
reported amplitudes, if that helps. (There is no new data here, it
is just graphical rather than tabular.)
Again, this is from a simulation, and I purposely introduced 10mV of
gate imbalance to model imperfectly-matched FETs. It is the raw
output from the doubler, with no traps installed. The breadboard
circuit performs similarly, although the 5MHz and 15MHz components
are about 10dB lower from the breadboard than they are shown in this
simulation (this depends on how well matched the FETs are -- I was
able to get a better balance in real life than the imbalance I
purposely introduced for this simulation).
Best regards,
Charles
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