AWR6843ISK: Measurement method of power ripple

Hi, 

Are you using your own EVM design or are you using a TI EVM?

Best Regards,
Kevin 

Hello~

I'm using both.

 -TI EVM : AWR6843ISK

   └ I also have mmWaveICBoost & DCA1000EVM

 -Self design : AWR6843ABGABLQ1

Thank you.

Hi Park Junehee,

Has your design schematic been reviewed by TI?

Best Regards,
Kevin

Yes, I got a review end of January.

But only PMIC got a review.

anyway, I want to measure power-rail ripple.

What equipment should I use to measure it?

Hi Junehee,

Understood, let me quickly verify. Will update within 24 hours.

Best Regards,
Kevin

Hi Junhee,

                      The Ripple specifications in the datasheet mention the AWR6843's Power Supply's rejection ratio performance. To debug the observed noise in RX spectrum I would recommend to start measuring the Noise/ripple on 1.8 and 1.0V of device. You can use high frequency oscilloscope for the transient an dripple measurements and try to capture the waveform especially during chirping. 

We also need to scope these rails before and after the filters to see the overall behavior of the power supply filters, decaps.

Additionally, the layout of these supplies to the device needs to be checked if there is a high IR drop.

Regards