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| EKG front end circuit |
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| David Hess:
--- Quote from: Wimberleytech on October 26, 2018, 10:05:41 pm ---You need enough bandwidth to handle the QRS pulse with enough cutoff to knock out 60Hz. --- End quote --- Why not notch out 60Hz in a separate stage to relax the low pass filter requirements? This might be a good application for inserting an integrator between the output of the instrumentation amplifier and its reference input to create an AC coupled instrumentation amplifier with a high pass cutoff at a low frequency. |
| TimNJ:
--- Quote from: David Hess on October 31, 2018, 04:57:50 pm --- --- Quote from: Wimberleytech on October 26, 2018, 10:05:41 pm ---You need enough bandwidth to handle the QRS pulse with enough cutoff to knock out 60Hz. --- End quote --- Why not notch out 60Hz in a separate stage to relax the low pass filter requirements? This might be a good application for inserting an integrator between the output of the instrumentation amplifier and its reference input to create an AC coupled instrumentation amplifier with a high pass cutoff at a low frequency. --- End quote --- Indeed. Did an ECG for my senior design project..never fully finished it, but we used a circuit like that. DSP filtering, namely an adaptive FIR filter, would be a good fit for this type of signal. |
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