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TSW1265 & TSW1400

Taeyeop Kwon
Prodigy 150 points

Hi, I'm Taeyeop.

I use TSW1265 & TSW1400 for RF receiver.

I need to domodulate captured data, because they are not baseband signals.

Using matlab I have tried to demodulate baseband I/Q data, but it has not worked well.

I think DDC(digital down conversion) code doesn't have big problem.

Demodulated siglas are similar shapes comparing with orginal ones, but they are not time-aligned.

Demodulated siglas are totally different from origin ones, but similar shaping.

Red : original in-phase signal,    Blue : demodulated in-phase signal
I used time-alignment code, but they have no correlation.

 

I don't know what's the problem..

Would you advise anything helpful for DDC ?

Is there any critical issue for implementing DDC?

Thank you for reading.

Regard

  • 0
    TI__Genius 17340 points

    There are many IQ demodulation information resources that can be found by searching the web. The frequency of the mixing signal needs to be selected correctly. An error in the mixing frequency could result in incorrect demodulation.

    Regards,
    Matt Guibord