6.15 Assume zero skin-electrode impedance, and design (give component values for) simple filters that will attenuate incoming 1 MHz radiofrequency interference to 0.001 of its former value. Sketch the placement of these filters (show all connections) to prevent interference from entering an ECG ampli- fier. Then calculate the 60 Hz interference that they cause for common-mode voltage of 10 mV and skin-electrode impedances of 50 kn and 40 kn. 6.16 You design an ECG machine using FETs such that the Zin of Figure 6.11 exceeds 100 M. Because of radiofrequency (RF) interference, you wish to add equal shunt capacitors at the two Zin locations. For em = 10mV, Z₁ =100 kn, and Z₁ = 80 kn, calculate the maximal capacitance so 60 Hz VA - VB = 10 μV. Calculate the result using (6.19). 617 Silicon diodes having a forward resistance of 2 2 are to be used as