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MMWCAS-RF-EVM: why power divider use rf resistor, the chip's FMCW SYNCOUT terminal use standard thick film chip resistor?

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Prodigy 20 points
Part Number: MMWCAS-RF-EVM
Other Parts Discussed in Thread: AWR2243,

Hi, I have a question about 20GHz sync subsystem in AWR2243 cascade  MMWCAS-RF-EVM "PROC054E":

      In "PROC054E_FMCW_Sync.Schdoc", Wilkenson Power Divider use a RF resistor, max frequency limit is 50GHz,  (R136,R140)

      but in "PROC054E_SMA_SMP_Connectors.Schdoc", AWR_FMCW_CLKOUT use a standard thick film chip resistor.  (R79,R82,R83,R84,R85)

these resistors all in 20GHz sync subsystem, why use different type? the ternimal resistors are not important for 20GHz sync ? 

  • 0
    TI__Genius 13805 points

    Hi,

           The R136 and R140 Resistors need to support functional path of the 20GHz LO signal, whereas the other Resistances are for GND termination of the unused FMCW clock pins when NOT being used(this is presuming that these balls are disabled through internal registers also.

    Regards