[time-nuts] 10MHz Square to Sine Wave Conversion
D W
watsondaniel3 at gmail.com
Fri Jul 17 03:10:11 UTC 2015
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
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> On Jul 16, 2015, at 10:49 AM, skipp Isaham via time-nuts <time-nuts at febo.com> 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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