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Re: [Discuss-gnuradio] Complete USRP DDC Frequency Response Analysis

 From: Eng. Firas Subject: Re: [Discuss-gnuradio] Complete USRP DDC Frequency Response Analysis Date: Thu, 17 May 2007 21:44:09 -0700 (PDT)

```Dear Hans,

Attached is the graphs you requested for USRP decimation =250.

Regards,

Firas

http://www.nabble.com/file/8515/%5B0%201%5DMHz%2C%20decimation%3D250%2C%20CIC%2C%20HBF%2C%20CIC%2BHBF%20Response.JPG
[0 1]MHz, decimation=250, CIC, HBF, CIC+HBF Response.JPG
http://www.nabble.com/file/8516/%5B0%2032%5DMHz%2C%20decimation%3D250%2C%20USRP%20DDC%20Response.JPG
[0 32]MHz, decimation=250, USRP DDC Response.JPG
http://www.nabble.com/file/8517/%5B0%201%5DMHz%2C%20decimation%3D250%2C%20USRP%20DDC%20Response.JPG
[0 1]MHz, decimation=250, USRP DDC Response.JPG

Hans Glitsch wrote:
>
> Hi,
>
> Thank you very much for your help.  Can you post the output of your matlab
> program for 250 total decimation?  I would do it myself with your m file,
> but I don't have matlab.
>
> Thanks,
> Hans
>
>
> ----- Original Message -----
> Sent: Thursday, May 17, 2007 12:47 PM
> Subject: [Discuss-gnuradio] Complete USRP DDC Frequency Response Analysis
>
>
>>
>> Dear Friends,
>>
>> Attached is a complete MATLAB based USRP DDC frequency response Analysis
>> figures. The USRP DDC decimation rate was 64. The CIC filter response
>> (decimation =32), HBF response (decimation =2) and cascaded CIC + HBF
>> (total
>> decimation =64) response figures are attached. The MatLab source file
>> used
>> in this analysis is also attached.
>> I hope this is a useful work.
>>
>> Regards,
>>
>> Firas,
>>
>> http://www.nabble.com/file/8500/%280%20-%2032%29MHz%29%20CIC%20Frequency%20Response%20%28CIC%20decimation%20%3D32%29.JPG
>> (0 - 32)MHz) CIC Frequency Response (CIC decimation =32).JPG
>> http://www.nabble.com/file/8501/%280%20-%202%29MHz%29%20CIC%20Frequency%20Response%20%28decimation%20%3D32%29.JPG
>> (0 - 2)MHz) CIC Frequency Response (decimation =32).JPG
>> http://www.nabble.com/file/8502/Useful%20Band%20%280%20-%201%29MHz%29%20%20HBF%20Frequency%20Response.JPG
>> Useful Band (0 - 1)MHz)  HBF Frequency Response.JPG
>> http://www.nabble.com/file/8503/Useful%20Band%20%280%20-%201%29MHz%29%20CIC%20%2B%20HBF%20Frequency%20Response%20%28decimation%20%3D64%29.JPG
>> Useful Band (0 - 1)MHz) CIC + HBF Frequency Response (decimation =64).JPG
>> http://www.nabble.com/file/8504/Full%20Band%20%280%20-%2032%29MHz%29%20USRP%20DDC%20Frequency%20Response%20%28decimation%20%3D64%29.JPG
>> Full Band (0 - 32)MHz) USRP DDC Frequency Response (decimation =64).JPG
>> http://www.nabble.com/file/8505/Useful%20Band%20%280%20-%201%29MHz%29%20USRP%20DDC%20Frequency%20Response%20%28decimation%20%3D64%29.JPG
>> Useful Band (0 - 1)MHz) USRP DDC Frequency Response (decimation =64).JPG
>> The MATLAB m File used to generate the above figures:-
>> http://www.nabble.com/file/8506/usrpddc.m usrpddc.m
>>
>> --
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>>
>>
>>
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>>
>>
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```