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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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