a) [1pts] Draw the equivalent circuit for the system featuring a series combination of the Enterra II as voltage source, connected to an electrode, then the tissue, followed by the

other electrode and back to the voltage source. b) [2pts] Using a) draw the equivalent circuit for the instantaneous response at t=0s. c) [2pts] Using a) and assuming that the ON time for the pulse is much greater than ~5t,draw the equivalent circuit. d) [5pts] The Enterra II features a non-rechargeable battery and the implant must be surgically removed when the battery runs out. Wireless charging systems generally include antennas featuring loops for inductive charging. Using the theory covered inECEN2250S21, explain why a HF, high frequency current feeding an inductor inside the device can present an issue for the neuro stimulator.