3) (40p) The electrical signals of the heart are called Electrocardiograms (ECG). ECG signals received from the body are amplified with the help of instrumentation amplifier and then filtered with filter circuits (This amplifier circuit was given to you in the sample question solutions).

a) First, use a LM741 OPAMP to design a second order Low Pass with a cut frequency of 100 Hz, and a second order High Pass Filter with a cut frequency of 1 Hz, and change the gain of the circuit by frequency so that the input signal is Vac = 10 V. Draw on PSPICE. Specify the cut-off frequency values in the drawing-3dB.

b) Repeat the same operation with 50 Hz for AGF and 10 Hz for YGF.

c) Design the Instrumentation Amplifier gain to be Av = -42. Apply the attached ECG signal to the amplifier input (get V1 = 0) and plot the Vo output signal for 3 seconds 

d) Add the circuits in parts a and b to the amplifier output to draw and interpret the output signal for both cases.