The multitransistor circuit in Figure 5.61 is to be redesigned. The bias voltages are to be ±3.3 V and the nominal transistor current gains are
The design parameters of the bias stable circuit.
Answer to Problem D5.91DP
The value of the resistance required to design the circuit are
Explanation of Solution
Given:
The given circuit is shown in Figure 1.
Figure 1
Calculation:
Mark the current and other parameters than redraw the circuit.
The required diagrams is shown in Figure 2
Figure 2
The value of the base current of the first transistor is calculated as,
Substitute
The value of the base current of the second transistor is calculated as,
Substitute
Apply KCL to the above circuit.
The expression for the current
Substitute
From KCL the expression for the emitter current of the second transistor is given by,
The expression to determine the voltage
The expression to determine the value of the resistance
The expression to determine the value of the collector voltage is
The expression to determine the value of the resistance
Substitute
By KCL in Figure 2 the expression for the current
Substitute
The expression to determine the value of the emitter voltage
The expression to determine the value of the resistance
Substitute
The expression for the Thevenin voltage is evaluated as,
The Thevenin equivalent base circuit is shown in Figure 3.
Figure 3
Apply KVL to the above circuit.
For bias stable voltage the value of the Thevenin equivalent resistance is given by,
Substitute
Substitute
Substitute
The expression to determine the value of the Thevenin equivalent resistance is given by,
Substitute
Conclusion:
Therefore, the value of the resistance required to design the circuit are
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Chapter 5 Solutions
Microelectronics Circuit Analysis and Design
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