(a)
The quiescent collector currents and the dc voltage at the output.
(a)
Answer to Problem 12.36P
The value of
Explanation of Solution
Given:
The give circuit is shown in Figure 1
Calculation:
The value of the collector current of the first transistor is calculated as,
The value of the collector current of the second transistor is calculated as,
The value of the collector voltage of the second transistor is given by,
Substitute
The expression for the output voltage is calculated as,
Substitute
The collector current of the third transistor is equal to its emitter current and is given by,
Conclusion:
Therefore, the value of
(b)
The value of the small signal voltage gain.
(b)
Answer to Problem 12.36P
The value of small signal voltage gain is
Explanation of Solution
Given:
The give circuit is shown in Figure 1
Calculation:
The expression to determine the value of the small signal input resistance of the first transistor is given by,
Substitute
The expression to determine the trans-conductance of the first transistor is given by,
Substitute
The expression to determine the value of the small signal input resistance of the second transistor is given by,
Substitute
The expression to determine the trans-conductance of the second transistor is given by,
Substitute
The expression to determine the value of the small signal input resistance of the third transistor is given by,
Substitute
The expression to determine the trans-conductance of the third transistor is given by,
Substitute
Mark the values and draw the small signal equivalent circuit.
The required diagram is shown in Figure 2
Apply KCL at the node 1
The expression to determine the input voltage is given by,
Substitute
Substitute
Substitute
Apply KCL at the node 2
Substitute
The expression to determine the value of
Apply KCL at the node 3
Substitute
Substitute
Apply KCL at the node 4
Substitute
Substitute
Substitute
The expression for the small signal voltage gain is given by,
Substitute
Conclusion:
Therefore, the value of small signal voltage gain is
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Chapter 12 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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