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[Discuss-gnuradio] A/D Output

From: Sharif Shaher
Subject: [Discuss-gnuradio] A/D Output
Date: Thu, 30 Sep 2010 17:38:10 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20100915 Thunderbird/3.1.4


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.

Thank you,

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