Products > Test Equipment
RD JDS6600 25MHz 2-Channel DDS AW Function Signal Generator
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RD Tech:

--- Quote from: Messtechniker on July 20, 2017, 08:07:08 am ---Does the JDS6600 carry a CE mark?

I'm asking, because without it German customs may
have me return the unit or scrap it at my cost which is not funny.

Yes, I know the CE story. It basically means China Export :-DD

--- End quote ---
yes, we have CE mark for JDS6600, you can go to our page to check
RD Tech:

--- Quote from: Kleinstein on July 20, 2017, 03:08:15 pm ---Having 11 Bit resolution is already quite good from an simple R2R chain at the FPGA. For me it looks surprisingly good.
Medium grade DDS chips like the AD9850 only use an 10 Bit ADC, though they use a longer table (e.g. 4096 points). With just 2048 points for a period, there is limited use of more than 10 Bit resolution though.

The staircase like waveform with quite some ringing suggests that there is no good reconstruction filter. So one can expect quite some high frequency images. The fast output amplifier also has some disadvantages here.

Some jitter in the square wave is normal for directly generating the square from the FPGA.

--- End quote ---
thank you for your answer, our Waveform vertical resolution is 12 bit, 4096 points, and waveform is about 2048 points . so at x-2048 points, y-4096 points, at this
coordinate system, it show our waveform. For  R2R , it is not easy to design, because it is hard to design, so many DDS don't use this way, if it is design better , it will be more stable than chiop way.
pantelei4:

--- Quote from: Kleinstein on July 24, 2017, 08:53:29 am ---The jitter should not depend on the H/L ratio. It should be just a question of the 5 ns time raster. So it depends on the frequency too. This might even be the worst aspect of it. At frequencies that don't have a period that is an integer multiple of 5 ns will show the jitter. So more like low jitter only at a few special good frequencies.

--- End quote ---
This generator does not have jitter at non-multiple frequencies, unlike other budget DDS.
Diabolo:
Hello,

Here are some curves with FY2300H.
Square 10Mhz
-
Sinus 25 Mhz
-
Triangle 20 Mhz
-

Only everything is not perfect, the suite is here:
- https://www.eevblog.com/forum/testgear/new-generateur-dds-avec-altera-cyclone4/

Sorry for the hs.
Regards,
Diabolo
Enoch:
I received my JDS6600 yesterday, phase tracking no problem. :scared:
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