Part Number: ADS1293
Team,
We are developing a handheld ECG device using the ADS1293 low-power, 3-channel, 24-bit analog front-end (AFE) for biopotential measurements. Our hardware design closely follows the TI reference design for the ADS1293.
When using standard wired ECG lead clips or disposable Ag/AgCl electrodes, the device produces high-quality ECG signals with low noise, good signal amplitude, and stable waveforms.
However, when switching to dry electrodes, we encounter the following issues:
- Significantly higher noise levels
- Reduced ECG signal amplitude
- Unstable and distorted waveforms
We suspect these issues are related to the higher electrode-skin impedance associated with dry electrodes.
Are there any recommended front-end circuit modifications or design considerations for improving the ADS1293 performance with dry electrodes? For example, should we consider changes to the input network, biasing, right-leg drive (RLD), filtering, shielding, or any other aspects of the analog front end?
We would appreciate any recommendations or best practices for achieving reliable ECG signal quality when using dry electrodes with the ADS1293.