For the circuit in Figure P7.21, the transistor parameters are
Figure P7.21
a.
To design: The bias stable circuit for the given condition.
Explanation of Solution
Given:
The circuit is given as:
IEQ =1.5mA.
The parameters of the circuit is given as:
The design needed for the bias stability is given as:
Recalling the general rule that the circuit is considered to be stable only, if:
Evaluating the Thevenin resistance
Substituting the known values in the equation:
Evaluating the value of base current
Substituting the known values in the above equation:
The expression for Thevenin s voltage
Substituting the known values in the above equation:
The other expression for Thevenin s voltage
Substituting the known values in the above equation:
The value of resistance
Substituting the known values in the above equation:
Therefore, the designed values are:
b.
The small signal mid band voltage gain.
Answer to Problem 7.21P
The value of voltage gain
Explanation of Solution
Given:
The circuit is given as:
IEQ =1.5mA.
The parameters of the circuit is given as:
Evaluating the value of collector current
Substituting the known values:
Evaluating the value of
Substituting the known values into the above equation:
Evaluating the value of output resistance
Substituting the known values into the above equation:
Evaluating the value of voltage gain
Substituting the known values into the above equation:
Therefore, the value of voltage gain
c.
The value of the output resistance.
Answer to Problem 7.21P
The value of output resistance
Explanation of Solution
Given:
The circuit is given as:
IEQ =1.5mA.
The parameters of the circuit is given as:
Evaluating the output resistance
Substituting the known values into the above equation:
Therefore, the value of output resistance
d.
The lower 3dB corner frequency for the given circuit.
Answer to Problem 7.21P
The value of lower corner frequency is 19.81Hz.
Explanation of Solution
Given:
The circuit is given as:
IEQ =1.5mA.
The parameters of the circuit is given as:
Evaluating the value of lower 3dB corner frequency:
Substituting the known values to the above equation:
Hence, the value of lower corner frequency is 19.81Hz.
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Chapter 7 Solutions
Microelectronics: Circuit Analysis and Design
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