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Hello,
I use a TSW 3085 as Tx and a TSW 1266 as Rx. Using signals with a sampling rate equal to that of the user guide (614,4M) I get a good SNR and the received signal is the same as the one sent.
I have a question regarding the sampling rate. Which option do I have to change in the TSW308x Evaluation Module to change the sampling rate? and the TSW1266 Evaluation Module? writing a different rate in HSDC pro does not work, I believe I need to change something in the Evaluation Module to change the sampling rate.
Thanks for the answer
I need to find the interpolation and clock rate in the TSW3085 software control. If I send a pattern with a different rate, I can not adjust the sampling rate.
For example, using the test file:
If I use the WCDMA_TM1_complexIF30MHz_Fdata614.4MHz_1000.tsw and I set the data rate to 614.4 M in the HSDC pro, I can see the same signal in the spectrum analyzer.
If I use the WCDMA_TM1_complexIF30MHz_Fdata307.2MHz_1000.tsw and I set the data rate to 307.2 M in the HSDC pro, I can not see the same signal in the spectrum analyzer. I see a signal with half bandwidth.
I would like to know where I find the interpolation and clock rate options in TSW3085 Software Control. Is it in the LMK4800 Control? Is it in Advanced? Is it in Output? Is it in the Digital? Is it in the Input? I'm sending an image of the TSW3085 control set to a rate of 614.4 M. I found the description of how it works in the manuals, but I did not find where I have to switch in the TSW3085 Software Control.
Hello,
the interpolation rate is located in the digital:
if you are using TSW1400, there is another adjustment for FPGA clock
Hi,
We know that: data rate x interpolation = DAC sampling rate.
Using DAC3482_1228p8MHz_2xInt_NCO_30MHz_single_sync_source_mode the interpolation is 2x.
Using the WCDMA_TM1_complexIF30MHz_Fdata614.4MHz_1000.tsw and setting 614.4 SPS on the HSDC pro the system works perfectly.
Using the WCDMA_TM1_complexIF30MHz_Fdata307.2MHz_1000.tsw and interpolation of 4 x the systen doensn't work perfectly. The bandwidht is wrong and the spectrum have many repetitions
The system works correctly only if i setting data rate 614.4M.
My doubt is: What do I have to change for the system to run at a rate of 307.2M? And with lower rates? Which option do I have to change in tsw 3085 Software control? I'm sorry if the answer is obvious, but I have not found it in any manual.
Hi,
I think it is best that you save and send over your configuration file to review.
Basicaly, besides interpolation change, you will need to change the following also for the TSW1400 evaluation with HSDC PRO
Hello,
I can only describe the high level setup that you will have to configure yourself. You will have to work with the clocking team (forum) offline to set your own LMK04800 setting
1. you need to adjust the PLL loop 1 to still accept the 61.44MHz clock from the TSW3085 to ensure the TSW3085 are synchronized to your TSW1266 for coherent observation path for the DPD
2. you will need to adjust PLL loop2 VCO such that the clock divider output will have divided down clock to be 77.8MHz.
The following two main setting in the LMK04800 are the ones that you need to adjust.
Unfortunately this forum is not for the discussion of both system setup (for your overall transmitter and observation receiver setup) and also clocking setup. This is a task that you have to do on your own for your development. I can only provide some tips for you to continue. Good luck with your project!
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