(a) In the circuit of Fig. P1.14 let R1 5 25 kV, R2 5 R3 5 30 kV, R4 5 120 kV, and VS 5 3 V. Sketch and label vI and vO versus time if vI is a 500-Hz triangular wave with peak values of 65 V. Show all...

(a) In the circuit of Fig. P1.14 let R1 5 25 kV, R2 5 R3 5 30 kV, R4 5 120 kV, and VS 5 3 V. Sketch and label vI and vO versus time if vI is a 500-Hz triangular wave with peak values of 65 V. Show all breakpoints and slopes. Can you suggest a possible application for this circuit?

Hint: consider fi rst the case vI $ 0, and show that D3 and D4 are off, and that if vI is gradually increased from 0 V, a point is reached at which D1 goes on, and then another at which D2 goes on. Then, exploit the fact that circuit behavior for vI , 0 is symmetric of that for vI . 0. (b) What happens if D2 and D4 are removed?