
Concept explainers
(a)
To show: The expression for the value of the current
(a)

Explanation of Solution
Given:
The given circuit is shown in Figure 1
Figure 1
Calculation:
The expression for the current
The expression for the current
Both the JFET are matching so,
The expression to determine the value of the differential mode voltage is given by,
So the difference of current is,
The value of the sum of the drain current is given by,
So,
Square both the sides of the above equation.
Again square both the sides of the equation.
Solve further as,
The expression for the current
Conclusion:
Therefore, the expression for current ratios are
(b)
To show: The base current is switched to other transistor when
(b)

Explanation of Solution
Given:
The given circuit is shown in Figure 1
Figure 1
Calculation:
The diagram for the normalized dc transfer characteristics of MOSFET differential amplifier as a function of differential input voltage is shown in Figure 2
Figure 2
The expression to derive the expression for the differential input voltage is given by,
Therefore, the expression for the normalized differential voltage is given by,
Conclusion:
Therefore, the required expression is
(c)
To show: The expression for the maximum forward transconductance is
(c)

Explanation of Solution
Calculation:
The expression for the current
Differentiate both the sides of the equation.
Conclusion:
Therefore, the expression for conductance is
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Chapter 11 Solutions
Microelectronics: Circuit Analysis and Design
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