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
Thank you to everyone for the help so
----- Original Message -----
Sent: Wednesday, May 16, 2007 11:19
Subject: Re: [Discuss-gnuradio] CIC stop
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.
Eric Blossom <address@hidden> wrote:
Wed, May 16, 2007 at 04:00:24PM -0700, Hans Glitsch wrote:
> What is the stop band of the FPGA CIC filter? How do
I figure out the
> attenuation at a given frequency outside my
> I'm decimating by 250.
It's a fourth order CIC.
http://users.snip.net/~donadio/cic.pdf for the transfer
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