As long as both diodes are off, the circuit of Fig. P1.23 is an inverting amplifi er giving vO 5 2(R2yR1)vI . But what if either diode conducts? Analyze the circuit and then sketch and label its VTC over the range 210 V # vI # 110 V. Show all breakpoints and slopes. Hint: examine fi rst the case vI $ 0 and show that with vI 5 0 V, D1 is off, but increasing vI will eventually turn D1 on. Then, exploit the fact that circuit behavior for vI , 0 is symmetric of that for vI . 0.
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