[time-nuts] 10MHz Square to Sine Wave Conversion

timeok at timeok.it timeok at timeok.it
Fri Jul 17 05:49:20 EDT 2015



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 <watsondaniel3 at gmail.com> 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
> >
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