On Fri, Sep 5, 2008 at 5:04 PM, Richard Jaeger <[EMAIL PROTECTED]> wrote:
> Well, if the gain is really in (0.5, 1), that makes my missing gain
> situation worse. I would be hunting for more than 20,000 in that case.
> Also, it is inconsistent with my measurements that show that the gain
> increases by a total of 26 dB as the decimation rate
> is changed from 96 to 256.
>
> ---
>
> Where is the shifter you are referring to? Is it in a non-recursive
> implementation of the CIC filter?
If you take a look here:
http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib/cic_dec_shifter.v
All that's happening here is the decimation rate chooses a different
slice of the output of the CIC filter. Once you go past a decimation
rate of 107, the bitgain becomes 28 and stays there no matter what.
Brian
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