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AWR1642: How to verify STC & WFG.

pop lin
Prodigy 60 points
Part Number: AWR1642

How to verify  STC & WFG for AWR1642.

STC (Sensitivity Time Control) curve.

WFG (WaveForm Generator).

  • IF/STC

    • IF Gain

    • IF OP P1dB

  • WFG

    • Linearity

    • Phase Noise

    • Spur/Harmonics

  • 0
    TI__Guru 58035 points
    Hello Pop Lin,
    In general we recommend using the Radar studio tool to RF evaluation, this is part of the DFP package (www.ti.com/.../mmwave-dfp).
    This tool allows you to configure the front end in the desired mode easily perform the RF tests without having to write your own code.

    To answer your specific questions: You can measure RX chain (not only IF but complete RX chain) by feeding a CW at the RX input at a known level and looking at the ADC amplitude. 1V pp at the ADC input corresponds to ADC full scale. In a similar way you can measure the p1db point as well.
    To measure linearity and phase noise, you can either measure the phase noise directly on the TX output by transmitting a CW or the radar studio tool allows you to bring synth/32 signal out on a test port (OSC_CLKOUT) and you can measure the phase noise on that using a phase noise analyzer. Similarly you can send a chirp and monitor the same single to measure the linearity.

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    Intellectual 425 points

    Sir,

    About RX feeding a CW, it need a 81GHz Signal generator, right?

    For phase noise measurement  from TX output, it need a 81GHz spectrum, right?

    Is it possible to apply another method to get similar information without signal generator & spectrum?

  • 0 in reply to JY Su
    TI__Guru 58035 points
    Hello ,
    That is right, you would need the signals to be at 76-81Ghz. Typically instead of connecting directly to a 81Ghz signal generator, a lower frequency signal generator is used along with a frequency extension module (its like a mixer with multiplier) that upconverts the signal to 81Ghz. VDI mmwave frequency extension modules are an example of this. Same can be used in case of a spectrum analyzer.

    Regards,
    Vivek