The transistor current gain
Figure P6.52
A.
The range in the dc values of
Answer to Problem 6.52P
Range of emitter current
and range of emitter current
Explanation of Solution
Given:
Range of transistor current gain
The circuit is given below:
From above circuit, considering BJT s single node, then by KCL, Quiescent emitter current
In CE mode,
From equation (1) and (2),
Now, DC analysis of the given circuit:
Reduce source Vs to zero and open the capacitor as shown below:
For
Applying KCL in the base-emitter loop to determine
From equation (3)
Using equation (5) give,
From dc analysis of the circuit, the emitter voltage is,
For
From equation (4)
From equation (3)
Using equation (6) give,
From dc analysis of the circuit, the emitter voltage is,
So, final range of emitter current
and final range of emitter current
B.
Range in the values of input resistance
Answer to Problem 6.52P
Final range of input resistance
and final range of input resistance
Explanation of Solution
Given:
Range of transistor current gain
The circuit is given below:
For
From equation (2)
Now, small signal analysis of the given circuit:
Reduce dc voltage sources to zero, dc current source to open and capacitors to short.
Diffusion resistance
Input resistance
Input resistance
For
From equation (2)
Diffusion resistance
Input resistance
Input resistance
So, final range of input resistance
For
Small signal voltage gain
For
Small signal voltage gain
So, final range of input resistance
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Chapter 6 Solutions
Microelectronics: Circuit Analysis and Design
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