[hpsdr] Taylor series corrected DDS

[Alex]

Hmm,
If I'm reading their diagrams right (fig 20 & 21), it looks like the spurs are -70dB below the output.

Alex, N3NP

----- Original Message ----
From: KD5NWA <kd5nwa at cox.net>
To: hpsdr at hpsdr.org
Sent: Wednesday, June 14, 2006 1:53:48 AM
Subject: Re: [hpsdr] Taylor series corrected DDS

***** High Performance Software Defined Radio Discussion List *****

I mentioned something similar several month ago, I'll look for the 
article, it basically eliminates the spurs by randomizing the lower 
digit so that cycle after cycle the spur occurs in a different spot 
so it does not have so much energy.

The outcome thought is that the overall noise floor is raised, after 
all that energy has to go somewhere, it's just being spread around so 
it does not build up on any one spot.


At 12:37 AM 6/14/2006, you wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>
>Just came across this technique for improving the performance of DDS.
>
>http://www.xilinx.com/xlnx/xebiz/designResources/ip_product_details.jsp?
>key=Direct_Digital_Synthesizer
>
>
>
>Looks like an interesting  and relatively low overhead way of reducing DDS
>spurs.
>
>73's Phil...VK6APH
>
>_______________________________________________
>HPSDR Discussion List
>To post msg: hpsdr at hpsdr.org
>Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
>HPSDR web page: http://hpsdr.org
>Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/


Cecil Bayona
KD5NWA
www.qrpradio.com

"Windows the worlds most successful software virus" 

_______________________________________________
HPSDR Discussion List
To post msg: hpsdr at hpsdr.org
Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
HPSDR web page: http://hpsdr.org
Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/




 1150285264.0