The magnitude of the current gain and the relationship between
Answer to Problem 12.8TYU
The relation between the current gain with the change in resistance
Explanation of Solution
Given:
The given diagram is shown in Figure 1
Figure 1
Calculation:
Mark the nodes and redraw the circuit.
The given diagram is shown in Figure 2
Figure 2
Mark the values and draw the PSpice circuit for the above circuit.
The required circuit is shown in Figure 3
Figure 3
The snip for the drop box of the internal parameters of the transistor is shown in Figure 4
Figure 4
The simulation settings to estimate the magnitude of the current gain as the value of
Figure 5
Then left click on the trace option then select add trace and type “ABS(l(RL)L(li))” then command in the trace magnitude of the current gain as the emitter resistance varies between
Figure 6
By KCL the expression for the current
The expression for the node voltage is given by,
Apply KCL at node
Substitute
The expression for the output current is given by,
Apply KCL at node
Substitute
Substitute
Consider
Thus, the expression for the small signal current gain is,
Conclusion:
Therefore, the relation between the current gain with the change in resistance
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Chapter 12 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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