Consider the circuit obtained from that of by lifting the op amp’s non-inverting pin off ground and driving it with the source vI , while the left terminal of R1 is connected to ground, in effect...

Consider the circuit obtained from that of by lifting the op amp’s non-inverting pin off ground and driving it with the source vI , while the left terminal of R1 is connected to ground, in effect transforming the op amp circuit from the inverting to the non-inverting confi guration. (a) Draw the modifi ed circuit. Then, assuming the Zener diode has VZ 5 5.1 V and all diodes have VD(on) 5 0.7 V, sketch and label the VTC if R1 5 1.0 kV and R2 5 13 kV. (b) Repeat if a resistance R3 5 39 kV is connected in parallel with the Zener diode.