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Original question:

AWR2243: AWR2243 cascade calibration

AWR2243: what`s the frequency stability of AWR2243?

xu qingjie
Intellectual 320 points
Part Number: AWR2243

Hi suppoter;

what`s the frequency stability of AWR2243?    Are there any RF chips available that have a frequency source stability of the order of 10e-8?

thanks!

  • 0
    TI__Guru 58035 points

    Hello ,

    The frequency stability of the 2243 device directly relates to the frequency stability of the 40Mhz reference clock provided to the 2243 device. If an xtal is used , the xtals have a large frequency change with temperature. If you provide a more accurate clock , like using a TCXO, then that would be more accurate. When you use an external clock you also need to take care of the phase noise. The phase noise requirements are provided in the datasheet.

    Regards,
    Vivek

  • 0 in reply to Vivek Dham
    Intellectual 320 points

    Hi Vivek;

    Thanks for your reply. If we use TCXO Frequency･Stability Tolerance  ±1.5×10－6  for AWR2243 casecade .How could we calculate the frequency stability of AWR2243？How much chirp linearity can we get？

  • 0 in reply to xu qingjie
    TI__Guru 58035 points

    Hello Xu,

    The synthesizer linearity depends on the chirp bandwidth and chirp slope configured . But its generally <0.5 Mhz of error for a very fast ramp. 

    Regards,

    Vivek

  • 0 in reply to Vivek Dham
    Intellectual 320 points

    Hi Vivek；

    thanks for your reply.We want to know if we can get better chirp linearity when we use TCXO.  what extend can we improve the chirp linearity by using TCXO？eg. <0.01 Mhz of error for a very fast ramp？

    thanks!

  • +1 in reply to xu qingjie
    TI__Guru 58035 points

    Hello Xu,

    I earlier thought you are referring to the offset error of the center frequency, hence i recommended TCXO. The chirp linearity does not improve with TCXO, it depends on the synthesizer. To improve the linearity you can reduce the slope of the chirp ramp. For a 10Mhz/usec slope you can get linearity with within 0.05 Mhz error. The 0.5Mhz error is mostly for ramps > 100Mhz/usec. slope.

    Regards,
    Vivek