Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 236 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AWR2243: AWR2243 ripple specifications

Rogers Chen
Intellectual 825 points
Part Number: AWR2243

Dear TI experts,

I noticed Table 8-2 in the AWR2243 datasheet and I have some questions about it:

1. Does this mean that the power supply ripple needs to meet the requirements mentioned in the table?

2. The unit of ripple in the table is uVRMS, which is a big challenge for power supply design. How should we design the power supply to ensure that it can meet this characteristic?

3. It seems impractical to measure such a small ripple through an oscilloscope. So how should we tto verify that our power supply design meets the requirements?

Thank you!

  • 0
    TI__Guru 58035 points

    Hello ,

    if you need the spurs in the RX to be below -105dBFS then you need to meet the ripple levels mentioned in the datasheet. If in your system you can tolerate higher spur levels you can relax the ripple requirements , the relation is dB -to- dB. ie one 1dB relaxation in spur level leads to 1dB relaxation in ripple level.

    if you are using DC DCs to provide the supplies, the main ripple component on the supply would be the switching frequency of the DCDC. You would need secondary LC filters on the board to filter this ripple. Please refer to the AWR2243 EVM ( https://www.ti.com/tool/AWR2243BOOST) for such a design. 

    You can do this measurement using a good spectrum analyzer connected to high impedance probes.

    regards,

    vivek