[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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