Hello, I can give you a precise MATLAB based simulated USRP frequency response. All what I need is the HBF coefficients. So this is an open invitation to our dear Matt to give us his designed USRP HBF coefficients or frequency response.
Firas, Hans Glitsch wrote: > > Hello, > > Thank you for the graphs. I wasn't aware that there was a HBF after the > CIC. Yes, I'd like to know the frequency response of the whole usrp from > input to output when I decimate by 250. > > Thank you to everyone for the help so far, > Hans > ----- Original Message ----- > From: Firas abbas > To: Hans Glitsch > Cc: gnuradio mailing list ; Eric Blossom > Sent: Wednesday, May 16, 2007 11:19 PM > Subject: Re: [Discuss-gnuradio] CIC stop band > > > Dear Hans, > > I think you meant the frequency response of CIC+ HBF filters. However, > the USRP CIC decimation filter has 4 stages. I did MATLAB analysis for 4 > stages CIC filter with decimation rate of 250 (as you requested) without > the HBF. The spectrum analysis result is attached. The first plot is for > entire range [0 to Fs/2]. The second one is zoomed near the interested > band. You will see a huge theoretical gain (more than 190 dB) because of > CIC bit growth. > > Firas > > Eric Blossom <[EMAIL PROTECTED]> wrote: > On Wed, May 16, 2007 at 04:00:24PM -0700, Hans Glitsch wrote: > > Hello, > > > > What is the stop band of the FPGA CIC filter? How do I figure out > the > > attenuation at a given frequency outside my bandwidth? > > > > I'm decimating by 250. > > > > Thanks, > > Hans > > It's a fourth order CIC. > See http://users.snip.net/~donadio/cic.pdf for the transfer function. > > Eric > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > > > > ------------------------------------------------------------------------------ > > > > > > > ------------------------------------------------------------------------------ > > > > > > > ------------------------------------------------------------------------------ > > > Internal Virus Database is out-of-date. > Checked by AVG Free Edition. > Version: 7.5.467 / Virus Database: 269.6.5/792 - Release Date: 5/6/2007 > 9:01 PM > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/wise-big-block-interleaving-in-GNURadio-tf3768964.html#a10666406 Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
