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Need help by configuring TSW3085EVM

Martin Althaus
Prodigy 60 points

Hi

i want to create a 4 Mhz-bandwith signal at 2.672 GHz .In the High speed converter i create this tones.  I apply a LO at 2.1672 Mhz  When i load in the 3085 GUI the file

DAC34821228p8MHz_2xInt_NCO_30 Mhz_single_sync_source_mode

and send, i can observe on the analyser a lot of signals with 150 Mhz difference to the LO. Can someone explain the settings that i have only my wanted signal. i assume the settings in the  NCO section the reason. One time i could observe only my modulated carrier, but up to now icant find out the settings

Thanks for answers

  • 0
    Prodigy 60 points

    Hello.

    i found out that i have the wrong sample frequency adjusted,  and the mixer must be  disabled.

  • 0 in reply to Martin Althaus
    TI__Guru 73389 points

    Martin,

    The default configuration file has the NCO mixer set at 30MHz with DAC sampling rate of 1228.8MSPS. You can adjust the NCO frequency by following the steps described in the NCO section (page 11) of the user's guide. If you do not need NCO or any type of mixer, be sure to disable the NCO and the mixer block. See page 10 for detail.

    -KH