Concept explainers
For the transistor circuit shown in Fig. 3.125, find IB and VCE. Let β = 100, and VBE = 0.7 V.
Figure 3.125
Find
Answer to Problem 89P
The value of
Explanation of Solution
Given data:
Refer Figure 3.125 in the textbook for the transistor circuit.
The common-emitter current gain
The base-emitter voltage
Formula used:
Write the expression for collector current in transistor.
Here,
Calculation:
Modify the given figure with the representation of currents and voltages as shown in Figure 1.
Apply Kirchhoff’s voltage law to input loop in Figure 1.
Substitute
Simplify the equation as follows.
Apply Kirchhoff’s voltage law to output loop in Figure 1.
Substitute equation (1) in (2).
Substitute
Conclusion:
Therefore, the value of
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