Hi, A while back I ordered an item of equipment from a very excellent eBay seller, johnkw40. He may be a member of the list, I'm not sure. He included a schematic for a low pass filter circuit to filter a 10 MHz square wave to a sine wave.
A quick analysis shows that it is a 5th order chebyshev filter with a cutoff frequency of about 14MHz. You could do better, but this filter can be built with only five standard value passives, which is quite convenient. I made a little SMT version of it and ordered the boards on OshPark. It seems to work pretty well. The circuit schematic and a screen shot of the response is attached. Any comments from the list on how that looks would be welcome. Dan
> On Jul 16, 2015, at 10:49 AM, skipp Isaham via time-nuts <[email protected]> > wrote: > > re: 10MHz Square to Sine Wave Conversion > > The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like > to convert it to a sine wave and I am looking for suggestions and info re > any reasonable pre-made circuits and/or boards. No sense reinventing the > wheel if I can avoid it. > > Otherwise I will start Sent from my iPhone > > Thank you in advance for your replies. > > Regards, > > skipp > > skipp025 at yahoo dot com > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.
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