
Concept explainers
Consider the circuit in Figure 6.70(a). Let
a.

The value of the Q-point for each transistor.
Answer to Problem 6.16TYU
The Q-point are given as:
Explanation of Solution
Given:
The transistor circuit is provided:
Where,
Consider the emitter current of Q2 transistor is same as the quiescent emitter current of transistor 2.
The expression for quiescent collector current (
Here ,
Substitute 1mA for
The expression for quiescent emitter current
Substituting 1 mA for
Now, the expression for quiescent collector current
Substituting 100 for
Write the expression for base voltage
Here ,
Substitute
Considering the expression for emitter voltage
Substituting 0V For
Considering the expression for emitter voltage
Substituting 0V FOR
The expression for current
Substitute
The expression for output voltage
Substituting 5V for
The expression for collector emitter quiescent voltage
Substituting 1V for
The expression for collector emitter quiescent voltage
Substituting 1V for
Therefore, the Q -point of transistor 1:
The Q -point of transistor 2:
.
b.

The small signal hybrid-
Answer to Problem 6.16TYU
The results are:
Explanation of Solution
Given:
The transistor circuit is provided:
Where,
Now, the expression for small signal hybrid
Substituting the 100 for
The expression for transconductance
Substituting 0.026V for
Consider the values or output resistance
The expression for small signal hybrid
Substituting 100 for
The expression for transconductance
Substituting 0.026V for
Thus the small signal parameter values are
c.

The small-signal voltage gain.
Answer to Problem 6.16TYU
The results are:
Explanation of Solution
Given:
The transistor circuit is provided:
Where,
The expression for output voltage
The expression for source voltage
Considering the expression for hybrid
Re-arranging the equation (3).
Considering the expression for current gain of transistor (
Substituting the equation (5) in (4)
Substituting the equation (6) in (1)
Substituting the equation (6) in (2):
The expression for voltage gain
Substituting the equation (7) and (8) in (9):
Substituting 0.377mA for
Thus , the voltage gain is -77.01
d.

The input resistance Ri .
Answer to Problem 6.16TYU
The input resistance are:
Explanation of Solution
Given:
The transistor circuit is provided:
Where,
The expression for input resistance
Substituting the 100 for
Therefore, the input resistance value is
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Chapter 6 Solutions
Microelectronics: Circuit Analysis and Design
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