Fully Analog Baseline Wander Elimination Circuit For Real-Time Ambulatory ECG Recording

This work describes a fully analog baseline wander elimination circuit that can be incorporated in the ECG sensor frontend. The proposed approach can effectively remove the baseline wander from ECG signals corrupted with motion artifacts by extracting the baseline level, and subtracting it from the original ECG signal in the analog domain. The baseline level is detected by linearly interpolating the sampled moving average values of the corrupted signal within a certain period. In this case, in order to exclude huge R-peak samples from the moving average, a skip sampling technique is adopted. The proposed circuit is realized with 0.18-µm CMOS technology using 1.8 V supply voltage. Results show SNR improvement of 26.7 dB after eliminating baseline wander from a corrupted ECG waveform with power consumption of 11.8 µW.