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ECG: understanding DRL

Question asked by libuz on Jun 26, 2012
Latest reply on Jun 26, 2012 by ScottH

In the DRL circuit show in the figure


why do we need the voltage follower ( can't we connect directly to inverting amplifier) ?

why do we use the capacitor 68pF, how do we choose the value?

why is 220pF used in the high pass filter after IN-amp ?