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Low pass filter for ECG

Other Parts Discussed in Thread: LMP7721, TLV2461, INA333, ADS1293

Hello people

I am trying to work on ECG AFE for a three lead portable ECG circuit .... While going through various circuits I was stuck at the LPF stage after the INA and before the ADC ... I am confused whether to choose a single pole active LPF or a double pole Sallen key filter for setting the 150 Hz cutoff frequency. Some books say a linear phase is required for signal to be produced distortionless in time domain so the latter option should be adopted. Can someone explain that more wrt the PQRST waveform. ....