Re: [time-nuts] spur prediction DDS software

2011-01-30 Thread Magnus Danielson
On 27/01/11 14:33, jimlux wrote: On 1/27/11 5:17 AM, Luis Cupido wrote: Hi, Is there a DDS spur prediction software around ? Not generically.. There is a dissertation out there with some matlab code. I'll see if I can find a link Most of the time what I do is write a little program in

Re: [time-nuts] spur prediction DDS software

2011-01-30 Thread Bruce Griffiths
Magnus Danielson wrote: On 27/01/11 14:33, jimlux wrote: On 1/27/11 5:17 AM, Luis Cupido wrote: Hi, Is there a DDS spur prediction software around ? Not generically.. There is a dissertation out there with some matlab code. I'll see if I can find a link Most of the time what I do is write

Re: [time-nuts] spur prediction DDS software

2011-01-30 Thread Bruce Griffiths
Bruce Griffiths wrote: Magnus Danielson wrote: On 27/01/11 14:33, jimlux wrote: On 1/27/11 5:17 AM, Luis Cupido wrote: Hi, Is there a DDS spur prediction software around ? Not generically.. There is a dissertation out there with some matlab code. I'll see if I can find a link Most of the

Re: [time-nuts] spur prediction DDS software

2011-01-30 Thread Bruce Griffiths
Bruce Griffiths wrote: Bruce Griffiths wrote: Magnus Danielson wrote: On 27/01/11 14:33, jimlux wrote: A problem with using a 2^(n-1) N 2^n is that the phase-sequence will run short compared to the usual binary bits taken from the top of the DDS, so this will needs to be handled. It

Re: [time-nuts] spur prediction DDS software

2011-01-29 Thread ehydra
I don't know how good it has to be but have you considered the Si570 or even one of the bigger more power hungry candidates from silabs? Really easy to drive this chip! - Henry Luis Cupido schrieb: Jim, Bob, Henry, Brian, Thanks to all. Very good. yeap, I do work on matlab so I think there

Re: [time-nuts] spur prediction DDS software

2011-01-28 Thread Luis Cupido
Jim, Bob, Henry, Brian, Thanks to all. Very good. yeap, I do work on matlab so I think there is plenty now to keep me busy ;-) tks. Luis Cupido ct1dmk. p.s.(what's cooking) I need a relatively narrow tunning range but absolutely free of close in spurs, willing to see if a modest size DDS

Re: [time-nuts] spur prediction DDS software

2011-01-28 Thread jimlux
On 1/28/11 3:59 AM, Luis Cupido wrote: Jim, Bob, Henry, Brian, Thanks to all. Very good. yeap, I do work on matlab so I think there is plenty now to keep me busy ;-) tks. Luis Cupido ct1dmk. p.s.(what's cooking) I need a relatively narrow tunning range but absolutely free of close in spurs,

Re: [time-nuts] spur prediction DDS software

2011-01-28 Thread Chris Caudle
On Fri, January 28, 2011 6:00 am, Luis Cupido wrote: p.s.(what's cooking) I need a relatively narrow tunning range but absolutely free of close in spurs, willing to see if a modest size DDS (inside an FPGA) will do so... and what parameters will be... A couple of guys came up with a scheme

[time-nuts] spur prediction DDS software

2011-01-27 Thread Luis Cupido
Hi, Is there a DDS spur prediction software around ? I mean for an arbitrary DDS design, like I would implement with logic or fpga etc. A code where I can enter nr of bits adc bits etc. (not a thing for a particular analog-devices chip or other dds chip) tks. Luis Cupido ct1dmk.

Re: [time-nuts] spur prediction DDS software

2011-01-27 Thread jimlux
On 1/27/11 5:17 AM, Luis Cupido wrote: Hi, Is there a DDS spur prediction software around ? Not generically.. There is a dissertation out there with some matlab code. I'll see if I can find a link Most of the time what I do is write a little program in matlab/octave, run a bunch of

Re: [time-nuts] spur prediction DDS software

2011-01-27 Thread jimlux
On 1/27/11 5:17 AM, Luis Cupido wrote: Hi, Is there a DDS spur prediction software around ? I mean for an arbitrary DDS design, like I would implement with logic or fpga etc. A code where I can enter nr of bits adc bits etc. (not a thing for a particular analog-devices chip or other dds

Re: [time-nuts] spur prediction DDS software

2011-01-27 Thread jimlux
On 1/27/11 5:17 AM, Luis Cupido wrote: Hi, Is there a DDS spur prediction software around ? I mean for an arbitrary DDS design, like I would implement with logic or fpga etc. A code where I can enter nr of bits adc bits etc. here's a good start.. Martin Pechanec's work...

Re: [time-nuts] spur prediction DDS software

2011-01-27 Thread Bob Camp
Subject: [time-nuts] spur prediction DDS software Hi, Is there a DDS spur prediction software around ? I mean for an arbitrary DDS design, like I would implement with logic or fpga etc. A code where I can enter nr of bits adc bits etc. (not a thing for a particular analog-devices chip or other

Re: [time-nuts] spur prediction DDS software

2011-01-27 Thread ehydra
The best once I found is this: http://www.holmea.demon.co.uk/FracN/Simulate.htm - Henry Luis Cupido schrieb: Hi, Is there a DDS spur prediction software around ? I mean for an arbitrary DDS design, like I would implement with logic or fpga etc. A code where I can enter nr of bits adc bits

[time-nuts] spur prediction DDS software

2011-01-27 Thread Brian Davis
Luis Cupido wrote: Is there a DDS spur prediction software around ? I mean for an arbitrary DDS design, like I would implement with logic or fpga etc. That dds_oddities.pdf file I linked to yesterday has a couple references on page 4: - Martin Pechanec’s MATLAB scripts ( mentioned earlier