
Concept explainers
Repeat Problem 1.47 if the reverse−saturation current for each diode isy



a.

The voltage across diode.
Answer to Problem 1.48P
The diode voltage,
Explanation of Solution
Given information:
The circuit diagram is given as:
The reverse saturation current for each diode is
Calculation:
The expression for the diode current is given as:
From the given circuit, evaluating the diode current:
From the circuit, the output voltage is same as the diode voltage.
Solving equation 1 and 2 by using the hit and trial method:
b.

The voltage across diode.
Answer to Problem 1.48P
The diode voltage,
Explanation of Solution
Given information:
The circuit diagram is given as:
The reverse saturation current for each diode is
Calculation:
The expression for the diode current is given as:
From the given circuit, evaluating the diode current:
Applying the Kirchhoff’s voltage law to the circuit from top to bottom:
Assuming the voltage across diode vD, then applying the Kirchhoff’s voltage law from top to the output voltage:
From the circuit, the diode current is same as the current flowing in the circuit:
Solving equation 1, 2 and 3 by using the hit and trial method:
c.

The voltage across diode.
Answer to Problem 1.48P
The diode voltage,
Explanation of Solution
Given information:
The circuit diagram is given as:
The reverse saturation current for each diode is
Calculation:
The expression for the diode current is given as:
From the given circuit, evaluating the diode current:
Applying the Kirchhoff’s voltage law to the circuit from top to bottom:
Then applying the Kirchhoff’s voltage law from top to the output voltage:
From the circuit, the diode current is same as the current flowing in the circuit:
Solving equation 1, 2 and 3 by using the hit and trial method:
d.

The voltage across diode.
Answer to Problem 1.48P
The diode voltage,
Explanation of Solution
Given information:
The circuit diagram is given as:
The reverse saturation current for each diode is
Calculation:
Referring the given circuit, here the diode current is flowing in the reverse direction.
Hence, the reverse saturation current will be the diode current in this case.
Since the value of the reverse saturation current is given in the question.
Therefore,
Now evaluating the diode voltage:
Since, due to reverse direction of the current, no current will flow through the resistor. Hence the drop across the resistor will be zero.
Therefore, the value of the diode voltage will be same as the output voltage:
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Chapter 1 Solutions
Microelectronics: Circuit Analysis and Design
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