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High baseline wander in ECG using ADS1298

Other Parts Discussed in Thread: ADS1298

Hi,


I'm currently using the ADS1298 to acquire ECG signals, which I process digitally on my PC. I've done no filtering to the signal in hardware. Sometimes, there's a lot of baseline wander in the signal, which causes trouble for me when I'm trying to filter the data. Here's a graph of the data after removing power line noise:

The top is the time domain plot, and the bottom is the frequency spectrum. I'm using a sampling rate of 500 Hz. As you can see, the wander is of much higher amplitude than the signal itself, and seems to have a downward exponential trend. Is this kind of baseline wander normal? Using baseline wander removing filters from the literature doesn't help much, as they are designed for much higher SNR. What can I do to get rid of the baseline wander?