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TSW30SH84EVM: using tsw30sh84evm with tsw1400evm, not getting desired output

Mayank Gupta99
Prodigy 250 points
Part Number: TSW30SH84EVM


I am using tsw30sh84evm with tsw1400evm. 

Below is the PLL setting.

Digital setting

Output 

•LO frequency is set to 1.47GHz
•We are getting a peak shifted by 60Hz at 1.53Hz
I have inserted "WCDMA_TM1_complexIF30MHz_Fdata737.28MHz_1000" file in HSDC pro. 

I am not getting the desired output as specified in the user file. Also, there are many harmonics coming to the output. Can you please specify, what I am doing wrong?

  • 0 in reply to Mayank Gupta99
    TI__Mastermind 18095 points
    The NCO is set to 60 MHz and you are getting a signal at 60 MHz offset from the LO, so that is looking as expected. When you use the WCDMA file the signal will offset an additional 30 MHz since that is how the pattern was created. I noticed the format setting was offset binary but I think that the pattern is created in 2's Complement. You can try to change that. You may also need to toggle the SIF Sync to "kick start" the data pattern.

    --RJH
  • 0 in reply to RJ Hopper
    Prodigy 250 points

    The format is "2's Complement" but we are getting the same result.

    This is the expected output. We are not getting this. Please look into it. 
    Thanks.

  • 0 in reply to Mayank Gupta99
    TI__Mastermind 18095 points
    Acknowledged that you are not getting the proper output. Let's step back a bit.

    Can you get a proper output with just engaging the "Constant Output"? This will verify that the DAC device is set up properly and that the modulator is working as expected. You can send a screen shot with your spectrum analyzer centered at 1.47 GHz with a span of 200 MHz and 400 MHz. You should see a CW tone at 60 MHz offset, some LO bleedthrough, and the suppressed lower sideband. There will also be some 2nd and 3rd BB harmonics.

    If that works as expected, then try to send a tone through HSDC Pro. A simple tone at say 5 MHz offset is sufficient. Turn off Constant Input and verify that the pattern is getting through by seeing your tone shift by 5 MHz.

    If that works, then you can inject the WCDMA pattern. The WCDMA signal will be at 90 MHz offset from the LO. You can zoom in on it and measure ACPR as from the User's Guide to verify that you are getting the proper power and linearity.

    If you are not able to get anything to work, send a copy of your configuration file from the GUI (i.e. Save Regs) and we can try to deduce the situation here.

    --RJH