• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 565 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

Original question:

ADS1299: baseline drift problem

ADS1299: Baseline drift.

Raghav Taneja
Prodigy 30 points
Part Number: ADS1299

I am using ADS1299 to measure bio-potentials.If everything is done correctly as mentioned in datasheet will ADS1299 output baseline drifts? If no then what can be done to improve it?

I am using bias amplifier to drive patient and measuring in referential montage from dry electrodes. I am 3 channels.

My configuration are as follows-

CONFIG1--0xD6 
CONFIG3--0xEC
CONFIG2--0xC2 
CH8SET--0x68
CH7SET--0x81
CH6SET--0x86
CH5SET--0x81
CH4SET--0x68
CH3SET--0x81
CH2SET--0x68
CH1SET--0x62

MISC1--0x00
BIAS_SENSP--0x8A

BIAS_SENSN--0x8A

  • 0
    TI__Guru 55152 points

    Hi Raghav,

    I often have questions related to a wandering DC baseline that occurs as the BIAS loop balances out the circuit after deriving its amplitude from the input electrodes. This is especially true when the electrodes selected to derive the BIAS signal have a changing contact impedance. This can be caused due to the patient moving and the electrode becoming unstuck, or an improper electrode connection to begin with. If they are available to you, I recommend using wet electrodes as they often allow for a more secure electrode connection to the patient. 

    Otherwise, the system can wait until the wandering baseline has settled before taking data. Another option is digital filtering to remove the wandering baseline. 

  • 0 in reply to Alexander Smith
    Prodigy 30 points

    Hi Alexander,

    I really appreciate your swift reply . I applied a high pass filter which stabilized the baseline since baseline wanders due to low frequency noise.