Concept explainers
Consider the BJT feedback circuit in Figure
(a)
The value of the voltage gain for the given values of
Answer to Problem 12.11TYU
The value of the voltage gain for
Explanation of Solution
Given:
The given diagram is shown in Figure 1
Figure 1
Calculation:
Apply KVL to the base emitter terminal of the circuit.
The value of the Thevenin equivalent voltage is calculated as,
The value of the Thevenin equivalent resistance is calculated as,
The emitter current is calculated as,
The value of the base current is calculated as,
The value of the collector current is calculated as,
The value of the small signal resistance is given by,
The expression to determine the voltage gain of the amplifier is calculated as,
The value of the input resistance is calculated as,
The value of the small signal voltage gain is calculated as,
By miller theorem the value of the resistance
For
From DC analysis the value of the base current is calculated as,
The value of the transconductance is calculated as,
The value of voltage gain is calculated as,
The value of the input resistance is calculated as,
The voltage gain is calculated as,
Conclusion:
Therefore, the value of the voltage gain for
(b)
The value of the voltage gain for the given values of
Answer to Problem 12.11TYU
The value of the voltage gain for
Explanation of Solution
Given:
Calculation:
Consider
The value of the base current is calculated as,
The value of the collector current is calculated as,
The value of the transconductance is calculated as,
The value of the voltage gain is calculated as,
The value of the voltage gain is calculated as,
Solve further as,
For
By miller theorem the value of the resistance
For
The value of voltage gain is calculated as,
The value of the input resistance is calculated as,
The voltage gain is calculated as,
Conclusion:
Therefore, the value of the voltage gain for
(c)
The percent change in the magnitude of the voltage gain from part (a) to (b).
Answer to Problem 12.11TYU
The percent change in the magnitude for
Explanation of Solution
Given:
Calculation:
The change in the magnitude of the voltage gain for
The change in the magnitude of the voltage gain for
Conclusion:
Therefore, the percent change in the magnitude for
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Chapter 12 Solutions
Microelectronics: Circuit Analysis and Design
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