LMV225: Abnormal output waveform

Part Number: LMV225

Hi,

Customers designed products using LMV 225. However, the product can not pass the shipping test at a frequency of 5%.
It is due to output malfunction of LMV225.
If they replace the LMV 225 with the same circuit board, the product will pass the test.

Questions,
  -  This output malfunction is genraly?
  -  Please tell me know how often this symptom occurs.
  -  Please tell me know solution for it.

Regards,
ACGUY

LMV225.pdf

6 Replies

  • Hi,

    I obtained a correlation waveform between RFin and VOUT. Please look the attached new file.

    RFin rises vertically, but Vout is tilted.

    Please tell me the cause and solution.

    Regards,

    ACGUY

    LMV225 Issue.pdf

  • In reply to ACGUY:

    Hi all,

    The occurrence frequency of this is around 5%.
    Is this a characteristic error of device?

    Please answer my question.

    Regards,
    ACGUY
  • In reply to ACGUY:

    Hello, my sincere apologies for the delay. It would be very helpful if you could provide some insight on the following:

    1. What is the RF signal freq. at PA output ?
    2. What is the max output power & range of output power for the PA ? The R1 resistor needs to be scaled accordingly to meet the 50 ohm impedance


    Thanks

    VC
  • In reply to VC Kumar:

    Hi VC-san,

    I obtained the input condition from customer.
    On the NG board that PA output ricochet to rise, then it becomes normal.
    When the resistance value of R1 is lowered, will the output of LMV 225 be improved?

    Regards,
    ACGUY

    PA_output.xlsx

  • In reply to ACGUY:

    Nagai-san

    Thank you, we are working to get you a response as soon as possible.  Apologies for the delay, thanks for the patience

    VC

  • In reply to VC Kumar:

    Hi VC-san,

    Thank you for reply.
    Customer's production line is on standby waiting for your response.
    If you have any update about this issue that please let me know as soon as possible.

    Regards,
    Nagai