Hi If you attach a filter with a shunt capacitor (capacitor to ground) at it’s input to the output of a logic gate, that gate will pull far more current than it would without a shunt capacitor being present. You can try to minimize this with a series resistor, but that’s only a partial fix.
Bob > On Jul 17, 2015, at 5:49 AM, [email protected] wrote: > > > > 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. _______________________________________________ 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.
