The circuit in Figure P 12.49 has transistor parameters:
the small-signal parameters for
(a)
The value of the small signal parameters for
Answer to Problem 12.49P
Thevalue of small signal resistances are
Explanation of Solution
Given:
The given diagram is shown in Figure 1
Calculation:
The small signal circuit for the given circuit is shown in Figure 2.
Figure 2
The expression to determine the value of the current
Substitute
The expression to determine the value of the voltage
Substitute
The value of the current
Substitute
The expression to determine the value of the current
Substitute
The expression for the small signal input resistance is given by,
Substitute
The expression for the trans-conductance of the first transistor is given by,
Substitute
The expression for the small signal input resistance is given by,
Substitute
The expression for the trans-conductance of the first transistor is given by,
Substitute
Conclusion:
Therefore, the value of small signal resistances are
(b)
The value of small signal closed loop current gain.
Answer to Problem 12.49P
The value of the small signal closed loop current gain is
Explanation of Solution
Given:
The given diagram is shown in Figure 1
Calculation:
Apply KCL at the source.
Substitute
Consider the KCL equation.
Substitute
Apply KCL at
Substitute
Substitute
Substitute
Substitute
The expression to determine the value of the output current is given by,
Substitute
Substitute
Conclusion:
Therefore, the value of the small signal closed loop current gain is
(c)
The value of the resistance
Answer to Problem 12.49P
The value of the resistance is
Explanation of Solution
Given:
The given diagram is shown in Figure 1
Calculation:
Substitute
The expression to determine the value of the input resistance is given by,
Substitute
The expression to determine the value of the input feedback resistance is given by,
Substitute
Conclusion:
Therefore, the value of the resistance is
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Chapter 12 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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