Re: [Discuss-gnuradio] frequency tuning word quantization

[Eric Blossom]

On Sun, Mar 05, 2006 at 10:32:05PM -0500, David I. Emery wrote:
> On Sun, Mar 05, 2006 at 05:53:44PM -0800, Eric Blossom wrote:
> > 
> > In the FPGA, the phase word (not the accumulator) is approximately
> > 15-bits wide.  This gives worst case phase-truncation spurs of -90 dBc.
> > This looks small enough that we can safely ignore it. Therefore, 
> > I suggest we stop truncating the tuning word on the host side.
> > 
> > Also, if we stop truncating on the host, then our frequency tuning
> > resolution will be 64e6 / 2**31 = 0.03 Hz.  Probably fine enough for
> > most uses.

FYI,

The fix to remove the host-side truncation of the frequency tuning
word went in yesterday.

Eric