The emitter−follower circuit shown in Figure P5.89 is biased at
Figure P5.89
The design parameters of the circuit.
To select: Five percent tolerance values of resistances.
To find: The range of the Q- point values.
Answer to Problem D5.89DP
The design parameters of the circuit are:
Five percent tolerance resistance
The range of the current is
Explanation of Solution
Given:
The given circuit is shown in Figure 1
Figure 1
Calculation:
Mark the current as well as other parameters and then redraw the circuit.
The required diagram is shown in Figure 2
Figure 2
The Thevenin equivalent bias circuit is shown in Figure 3
Figure 3
The value of the base current is calculated as,
Substitute
Apply KVL in Figure 2
The expression for the value of the Thevenin resistance is given by,
Substitute
Apply KVL to figure 3.
Substitute
The expression for the Thevenin voltage is evaluated as,
Substitute
The expression for the Thevenin resistance is given by,
From the five percent tolerance resistance
Now consider the value of
The value for the Thevenin resistance is calculated as,
Substitute
Substitute
The expression for the collector current is given by,
Substitute
Apply KVL in Figure 2
Consider the value of
The value for the Thevenin resistance is calculated as,
Substitute
Substitute
The expression for the collector current is given by,
Substitute
Apply KVL in Figure 2
The Q- point values of the current and voltage for the range of
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Chapter 5 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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