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AFE58JD48: AFE58JD48 Auto Offset Correction Mode (Offset Correction Using a Built-In Offset Calculation Function)

RENQIANG LI
Prodigy 20 points

Part Number: AFE58JD48

Hello, I am using the Auto Offset Correction Mode of the AFE58JD48 chip. However, when I configure the parameters according to the register instructions in the datasheet, it has no effect, and the signal still deviates from the baseline. Below are the parameters I have configured. Could you please help me check if there are any errors?

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  • 0
    TI__Intellectual 1350 points

    Hi,

    Auto offset correction will work only when OFFSET_REMOVAL_START_MANUAL register toggles from 0 to 1. Basically, offset correction will start only when either TX_TRIG sees a high pulse or OFFSET_REMOVAL_START_MANUAL register sees a rising edge. So you can do the following register writes in this sequence

    assign afe_offset_cfg[2] = {8'h21, 16'h0049};

    assign afe_offset_cfg[2] = {8'h21, 16'h004d};

    Alternately, TX_TRIG can be given a pulse to enable offset correction

  • 0
    Prodigy 20 points

    Hello, thank you for your explanation. This issue has been resolved. However, when we perform offset calibration at 0dB, the baseline is calibrated correctly. But as I configure the gain for amplification, the signal gradually deviates from the baseline along with the gain amplification. Could you please tell me what causes this? Do I need to perform offset calibration every time before amplification?

  • +1 in reply to RENQIANG LI
    TI__Intellectual 1350 points

    Hi,

    Yes, offset calibration needs to be performed every time before amplification. In order to do so, OFFSET_REMOVAL_START_MANUAL register should see a rising edge i.e. toggle from 0 to 1.