It is the simplest solution because you have not to tune the notch filter but you have -20dB on 2nd harmonic and -40dB for the third instead -50dB (min for both) if you made a low-pass with notch filters.
Luciano On Fri 17/07/15 05:10 , D W <[email protected]> wrote: > 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 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 [1] > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts [2] > and follow the instructions there. > > > > Links: > ------ > [1] > http://webmail.timeok.it/parse.php?redirect=https://www.febo.com/cgi-bin/ma > ilman/listinfo/time-nuts[2] > http://webmail.timeok.it/parse.php?redirect=https://www.febo.com/cgi-bin/ma > ilman/listinfo/time-nuts > Message sent via Atmail Open - http://atmail.org/ _______________________________________________ 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.
