<div><div dir="auto">At FlexRadio we use 0dBFS := sqrt (i^2+q^2) = max number space. So for a 16-bit ADC, this would be sqrt(i^2) or sqrt(q^2) which is i or q at max numerical value which would be 32767 for a converter in signed mode (most converters can output in different number spaces). I believe this comes out to the same definition as Ettus.</div></div><div dir="auto"><br></div><div dir="auto">When we convert to float in baseband, this value is assigned to 1.0F. Google just told that this value is also 17.222C as I was typing, but I'm pretty sure Google is wrong :-)</div><div dir="auto"><br></div><div dir="auto">Steve</div><div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jul 9, 2018 at 06:46 Ground-Station <ground-station@lists.openresearch.institute> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div><div>Yes, full power in both I and Q. I assume the thinking was that the highest power single tone that can be represented was the most relevant full scale definition. A square wave is an interesting alternative since it (and any summation of sub tones) are the only higher power signals that don't encounter distortion.<br></div></div><div>
<div><br></div>
<div>On Mon, Jul 9, 2018, at 3:39 AM, Ground-Station wrote:<br></div>
<blockquote type="cite"><div>On 7/9/18 02:43, Ground-Station wrote:<br></div>
<blockquote><div>At Ettus we use a sine wave with peaks at the rails.<br></div>
</blockquote><div><br></div>
<div>So a rail-to-rail square wave would be +3dBFS?<br></div>
<div><br></div>
<div>Does this include the power in both I and Q?<br></div>
<div><br></div>
<div>Thanks,<br></div>
<div><br></div>
<div>Phil<br></div>
<div><br></div>
<div><br></div>
<div><br></div>
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</blockquote></div></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><font color="#006600" face="verdana, sans-serif"><div><br></div><span style="color:rgb(0,0,0);font-family:arial"><div><font face="verdana, sans-serif"><font color="#006600">Stephen Hicks, N5AC</font></font></div></span>VP Engineering</font><br><font color="#000099" style="font-family:verdana,sans-serif;color:rgb(0,102,0)">FlexRadio Systems™<br>4616 W Howard Ln Ste 1-150<br>Austin, TX 78728<br>Phone: 512-535-4713 x205<br>Email: <a href="mailto:steve@flexradio.com" target="_blank">steve@flexradio.com</a><br>Web: <a href="http://www.flexradio.com/" target="_blank">www.flexradio.com</a></font><br><font face="verdana, sans-serif" color="#006600"><a href="https://sites.google.com/a/flex-radio.com/pgp-public-keys/n5ac" target="_blank">Click Here for PGP Public Key</a></font><br><br><div><img src="http://www.flex-radio.com/Data/Image/Vector-Logo.jpg" width="200" height="27"><br></div><div><br><i><font color="#000099"><font face="verdana, sans-serif">Tune In Excitement™</font></font></i><font color="#000099"><font face="verdana, sans-serif"><br>PowerSDR™ is a trademark of FlexRadio Systems</font></font></div></div></div>