Products > Test Equipment
RD JDS6600 25MHz 2-Channel DDS AW Function Signal Generator
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qq354813374:

--- Quote from: Diabolo on July 23, 2017, 12:00:57 am ---Hello,

At the request of @gby

Here is the new Feeltech DDS generator 14 bits-250 msa-8192 points without R2R equipped with an Altera Cyclone IV clocked with SPXO 50mhz .
The model I bought is FY2300H-25 Mhz.


regards,
Diabolo
https://www.eevblog.com/forum/testgear/new-generateur-dds-avec-altera-cyclone4/

--- End quote ---



Well-known brands of signal generators are all using DAC, which is R2R resistor network can not go beyond
technogeeky:

--- Quote from: qq354813374 on July 21, 2017, 08:16:07 am ---
--- Quote from: Kleinstein on July 21, 2017, 07:47:02 am ---Form the picture it looks like the DAC is not a pure R2R chain, but more like using thermometer style for the upper bits. So maybe someone confuses the 14 I/O pins used for control with a 14 bit resolution. At least the DAC seems to work reasonably well as 11 Bit this way.

The DAC type does not have direct influence on the noise with small signals. The waveform should be generated at constant amplitude and only the following multiplier and attenuators reduce the amplitude if needed.

--- End quote ---

You can look at the delicate degree of 14bit waveform

--- End quote ---

I'm sorry to be rude, but I am a bit concerned about your posts in this thread. I think you are trying to imply from the context and content of your posts that you are a mere consumer who has tried the Rui-Deng model and a FeelTech model function generator. Your profile says you're from England.

However:

* you list "feeltech" in your profile
* your username is typical of the email addresses offered primarily to Chinese users by Tencent
* a google search for that username reveals other posts in Chinese in various technical forums
* your English, while adequate, leads me to believe you speak English as a second language
* FeelTech is headquartered in China, and I'm not able to find any offices in the UK
I should note that all of this is just from information you offered (your username, listing feeltech in your profile) or otherwise publicly available information. And I don't know of any reason or rule that one's profile must be correct on this forum, so I doubt you've done anything wrong. I suppose I could believe that you are an Chinese expat living in the UK.

In any case, if you do work for Feeltech (and perhaps if you designed the product you are discussing) I  think you should be up front and honest about that fact. After all, who else would be better qualified to analyze the properties of a modern cheap function generator than a person who just designed a modern cheap function generator?

Thanks.
pantelei4:
The JDS6600 on the main signals does not have one clock jitter, if the duty cycle is 50%, but it is 5ns if the duty cycle is not 50%
Kleinstein:
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.

Depending on how frequency calibration is done the good frequencies can be slightly different, depending on the exact quartz frequency. In principle they could use a different frequency scale - allowing only good ones (e.g. divider) and maybe warn about poor ones.
RD Tech:

--- Quote from: pantelei4 on July 20, 2017, 04:14:51 am ---
--- Quote from: qq354813374 on July 20, 2017, 03:33:31 am ---JDS6600 Phase does not sync

--- End quote ---
Yes :horse:

--- End quote ---
I have admite and explain , we have improve this , this don't affect normall using ...
about this little problem, we are updating this.
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