[hpsdr] new DDS

[Alex]

Bob,
The AD9911 has a port for synchronizing multiple units.
What about software control of the 3 DDSes within the DSP library?
I have ordered 2 samples and I'm seriously thinking of using them with CASMIR.

Alex, N3NP

----- Original Message ----
From: Robert McGwier <rwmcgwier at comcast.net>
To: High Performance Software Defined Radio Discussion List <hpsdr at hpsdr.org>
Sent: Saturday, May 27, 2006 3:03:15 PM
Subject: Re: [hpsdr] new DDS

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

Leon Heller wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> http://www.analog.com/UploadedFiles/Data_Sheets/610141489AD9911_0.pdf
>
> Interesting feature is 'SpurKiller'technology.
>
> 73, Leon
>   
This is bloody brilliant.  Many of us have proposed blind deconvolution 
and of course, this is insanity compared to this.  The location of these 
spurs has a mathematical, closed form description.  Given the phase in 
the accumulator and the frequency,  you can mathematically compute the 
frequency, phase, and amplitude of these spurs to high accuracy.  They 
have chosen to take N of them (it looks like up to 3), invert them and 
add them to the output effectively suppressing the 3 worst (if I read 
this correctly).  To capture that in the hardware itself is a very nice 
piece of work.   I have not taken the time to see if this part can be 
sync'd or if they are introducing a I/Q version.

Bob


> --
> Leon Heller, G1HSM
> leon.heller at bulldoghome.com
> http://www.geocities.com/leon_heller
>   


-- 
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity.  Guilty as charged!

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