In the circuit shown in Figure P6.51, determine the range in small−signal voltage gain
Figure P6.51
The range in small-signal voltage gain
Answer to Problem 6.51P
The final range of the voltage gain
The final range of the current gain
Explanation of Solution
Given:
Range of
The given circuit is:
From above circuit, considering BJT s single node, then by KCL, Quiescent emitter current
In CE mode,
Now, DC analysis of the given circuit:
Reduce source Vs to zero and open the capacitor as shown below:
The Theveninresistance is:
Modify the circuit as:
Therefore, Thevenin voltage from above circuit is
Modify the circuit as:
Applying KCL in the base-emitter loop to determine
From (3), (4) and (5) and
From equation (2) and
Now, small signal analysis of the given circuit:
Reduce dc voltage sources to zero, dc current source to open and capacitors to short.
Diffusion resistance
Input resistance and
The input resistance
Now, small signal current gain
From (3), (4) and (5) and
From equation (2) and
Diffusion resistance
Input resistance
The input resistance
Now, small signal current gain
The final range of the voltage gain
The final range of the current gain
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Chapter 6 Solutions
Microelectronics: Circuit Analysis and Design
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