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Step 1 of 3 4.068P Refer to Figure 4.21 (a) in the textbook. The expression for exponential diode current equation is, (1) Here, the current flowing through the diode diode reverse bias current the voltage across the diode the thermal equivalent of voltage Let us take the current flowing through the diode is when voltage across the diode is and also assume that the current flowing through the diode is iD when voltage across the diode is Step 2 of 3 Consider the relation between different diode currents from equation (1). Step 3 of 3 Apply Kirchhoff's voltage law in the circuit Substitute = (since R is in kilo Ohms) Thus, the output voltage is verified and same.