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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