Tim wrote:
If you want to make it time-nutty, there's the NIST JFET "push-push"
frequency doubler we've talked about here in the past.
As I noted during the push-push doubler discussion, a push-push FET
doubler works much better if one does not run the FETs to cutoff. This
is because the FETs do not operate as switches, but rather as
common-base amplifiers. Running them into cutoff does nothing except
generate large amounts of undesired odd-order and higher even-order
harmonics in addition to the desired second harmonic.
I posted a schematic with graphs, comments, and discussion on Didier's site:
<http://www.ko4bb.com/getsimple/index.php?id=download&file=02_GPS_Timing/Frequency_doubler_push_push_JFET_schematic_description_discussion.pdf>.
The on-list discussion is included.
The posted design focuses on doubling 5MHz to 10MHz, but I tested the
prototype with 50MHz input (100MHz output) using J310s and 2N4416s, and
it worked fine.
Best regards.
Charles
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