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Re: [Discuss-gnuradio] max throughput USB 2.0

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] max throughput USB 2.0
Date: Sun, 12 Apr 2009 09:42:06 -0400
User-agent: Thunderbird (X11/20090105)

Vincenzo Pellegrini wrote:
> Maximum sustained throughput that we have achieved so far, given our
> chipsets and the USRP's cypress usb interface
> is 32 MB/sec that yields, at 16 bit sample resolution:
> 32M /  (2 *2) = 8Msps (complex) ==>8MHz bandwidth (Nyquist)
> 1 factor 2 is for I+Q channels
> the other is for 16bit (=2bytes) sample resolution
> of course, at the price of halving sample resolution you can get
> double bandwidth
> vincenzo
Using 8-bit samples, and a rather beastly machine, I can sustain 16Msps
for my SETI spectrometer application.

Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium

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