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TRF372017EVM: Different EVM Result between Zero IF and 100 MHz IF

Alan Ke
Prodigy 70 points
Part Number: TRF372017EVM
Other Parts Discussed in Thread: LMX8410L, TRF372017,

Hello,

We currently testing TRF370217 evaluation module & LMX87410L evaluation module.
Here is our testing setup & measurement result:
 

(I): ZERO IF testing setup & EVM result
 

(II) IF100MHz testing setup & EVM result
 

We found that there is a large difference between zero IF and 100MHz IF in EVM peak.
Is there any comment you can provide?
Thank you!

Best regards,
Alan Ke

  • 0
    TI__Guru 66074 points

    Hi Alan,

    Please check the image suppression of the overall chain with 100MHz IF case. For the ZIF case, your IQ offset is at -16dB. This means the image is within the passband, and is impacting EV% measurement. 

    You will need to adjust the I/Q phase of the overall input to the TRF372017EVM to suppress the I/Q offset to at least 40dBc to get good measurements. The TRF372017 does not have I/Q adjustment feature, so you will need to check if the LMX8410L have the I/Q gain/phase adjust capability.

    -Kang