2. Sketch the voltage transfer characteristic of the circuit below over the range -20 V < Vin <20 V. Use constant voltage drop model, VD. ON = 0.7 V in forward biased region. Vz1-2 V, V22 = 3 V and assume r₂ = 0. Clearly show all values and slopes. vin ☐ R1 ww 10ΚΩ D1 D2 R2 www 10ΚΩ vout ☐