Consider a diode circuit shown below. Assume that each diode can be modeled as a

Question

Consider a diode circuit shown below.

Assume that each diode can be modeled as an ideal diode in series with a voltage source, having Vf=0.7V. The resistor has a value of R1=10?. Check all statements that are true

a. If V1=2.3V and V2=2.3V, then Vo has a positive limit of 3 Volts and a negative limit of -3 Volts.

b. When any of the diodes are ON, the voltage across that diode is 0.7 V.

c. When Vin is in between the positive and negative limits of Vout, Vo=Vin.

d. When R1 is replaced with a resistor with higher resistance, the Voltage Transfer Characteristics (VTC) curve changes.

Explanation / Answer

Ans) If V1=2.3V and V2=2.3V, then Vo has a positive limit of 3 Volts and a negative limit of -3 Volts. True

Reason Whenever diode conducts output voltage Vo is sum of V1 /V2 and forward voltage Vf=0.7 V adding gives

3 V in both the cases as per their polarities in which they are connected

When any of the diodes are ON, the voltage across that diode is 0.7 V.--- True

Reason:The forward voltage of silicon diode under forward biased mode is 0.7 V

When Vin is in between the positive and negative limits of Vout, Vo=Vin.----True

Reason: When Vin is less that the output voltage limits neither diode conducts acts as a open circuit give Vo=Vin

When R1 is replaced with a resistor with higher resistance, the Voltage Transfer Characteristics (VTC) curve changes.----True

Reason: Change in R1 changes the voltage drop across the resistor for different (Vin)input voltages so we will

get different output voltage Vo so VTC curve (Vo Versus Vin) changes

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