On 09/30/2010 02:38 PM, Sharif Shaher wrote:
Hello, I am using gnuradio and a usrp2 to capture samples (shorts) to a file, that is 16 bit I and 16 bit Q. I looked at this data in matlab and noticed that in many instances the samples exceed 13 and 14 bits for both positive and negative numbers (ie -12567 or +12989). I was under the impression that a 14 bit a/d meant 13 bits plus a sign bit so max 8191, min -8191. Should I expect this behavior, am I interpreting something incorrectly. If this is expected can someone please explain. I though the rx_gain was applied before the a/d so the max output would be be 13 bits plus a sign bit.
You are seeing the effect of the digital down conversion in the FPGA, which includes scaling, and shifting, and filtering.
-Josh _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
