[time-nuts] Square to sine wave symmetrical conversion (part 2)

jerry shirᴀr radio.n9xr at gmail.com
Sat Jul 25 02:31:40 UTC 2015


Symmetry is based on the biasing of the sinewave feeding the gate that you
are trying to create a sinewave from.

Jerry N9XR.
On Jul 24, 2015 7:19 PM, "skipp Isaham via time-nuts" <time-nuts at febo.com>
wrote:

> Hello again,
>
> First off, I want to thank everyone who replied direct and through the
> group
> regarding my recent 10 MHz square to sine wave conversion info request.
>
> I obtained a mini-circuits 10.7 MHz low pass filter from Ebay cheap
> enough and I also plan on "rolling my own" based on some of the information
> and links provided in your generous replies.
>
> Part 2:
>
> With things in place, I actually looked at the actual square wave output
> port with
> a decent scope to see it's not even close to being symmetrical.  The
> waveform
> on-portion (duty cycle) appears (surprising to me) to be much less than 20%
>
> Now I'm under the assumption that proper rounding or conversion of the non
> symmetrical 10 MHz square to a sine wave will be a bit more involved.
>
> Before I launch toward part two of this latest saga, I'd really be
> interested in reading
> suggestions and comments regarding methods to improve/fix the 10 MHz
> waveform
> symmetry.
>
> Again, thank you in advance for your replies...
>
> Regards,
>
> skipp
> skipp025 at yahoo.com
>
>
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