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. ....
