Consider the circuit shown in the figure below.
The diodes D1 and D2 are non-ideal with cut-in voltages of 0.7 V and forward resistance rf=0Ω and rrev=∞. The Zener diode Dz has forward voltage drop of 0.7 V and a Zener voltage of 5 V. If an input sine wave of maximum peak amplitude of 10 V is applied at Vin, then the transfer characteristic of the circuit can be represented as