For the circuit in Figure P6.54, the parameters are
Figure P6.54
(a)
The value of
Answer to Problem 6.54P
The values of resistances are:
Explanation of Solution
Given:
Given circuit:
Given Data:
Calculation:
Considering the BJT (Bipolar Junction Transistor) as single node, then, by Kirchhoff’s current law, the quiescent emitter current
In CE mode:
The quiescent collector current
DC analysis of given circuit
(Reducing the ac source
The Thevenin resistance
(Shorting the voltage source)
Therefore, the Thevenin voltage from the above circuit,
Using the equation (3),
Modified circuit as,
Applying Kirchhoff’s voltage law around the collector-emitter loop as,
To calculate the value of
Small-signal analysis of given circuit
(Reducing the dc source to zero and the capacitors to short)
Diffusion resistance
The input resistance
Small signal current gain
Given the small signal current gain
Modified circuit as,
The Thevenin network is shown in above figure and
Kirchhoff's voltage law in the base-emitter loop as,
From equations (5), (8) and (9)
Combining equations (3), (4) and (10)
From equations (3) and (11)
Finding the output resistance
(b)
The current gain.
Answer to Problem 6.54P
The current gain for
Explanation of Solution
Given:
Given circuit:
Given Data:
Calculation:
Considering the BJT (Bipolar Junction Transistor) as single node, then, by Kirchhoff’s current law, the quiescent emitter current
In CE mode:
The quiescent collector current
DC analysis of given circuit
(Reducing the ac source
The Thevenin resistance
(Shorting the voltage source)
Therefore, the Thevenin voltage from the above circuit,
Using equation (3),
Modified circuit as,
Applying Kirchhoff’s voltage law around the collector-emitter loop as,
To calculate the value of
Small-signal analysis of given circuit
(Reducing the dc source to zero and the capacitors to short)
Diffusion resistance
The input resistance
Small signal current gain
Given the small signal current gain
Modified circuit as,
The Thevenin network is shown in above figure and
Kirchhoff's voltage law in the base-emitter loop as,
From equations (5), (8) and (9)
Combining equations (3), (4) and (10)
From equations (3) and (11)
Finding the output resistance
Determining the Small signal current gain
With load resistance
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Chapter 6 Solutions
Microelectronics: Circuit Analysis and Design
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