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Microelectronic Circuits (7th Edition) 
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7 Bookmarks Show all steps:Chapter 11, Problem 65P ON
Step-by-step solution
Refer to Figure P11.65 for the feedback trans resistance amplifier in the textbook.
(a)
Determine the voltage difference between the gate and source terminals of a MOSFET.
Consider the following expression:
Substitute 0.2 V for , and 0.5 V for .
Here, is the voltage difference between the gate and source terminals of a MOSFET.
Comment
Assume that the voltage difference between the gate and source terminals of MOSFET is 
 and that of MOSFET is .
Assume that the DC voltage at the gate of is and that of is .
The value of voltage is,
Substitute 0 V for .
The DC voltage at the input is equal to the DC voltage at the gate of .
Substitute 0.7 V for .
Therefore, the DC voltage at the input is .
Comment
The DC voltage at the drain of is equal to the DC voltage at the gate of .
Assume that the DC voltage at the gate of is .
 …… (1)
Comment
The expression for the DC voltage at the output is,
Substitute 0.7 V for .
Therefore, the DC voltage at the output is .
Comments (5)
Recall equation (1).
Substitute 0.7 V for both and .
Therefore, the voltage at the drain of is .
Comment
(b)
The expression for the transconductance is,
Here, is the amount of current flowing into the drain of the MOSFET.
Assume that and are the transconductances of the MOSFETs and .
The expression for the transconductance is,
Here, is the amount of current flowing into the drain of .
The amount of current that flows into the drain of is I.
Substitute for and 0.2 for .
Therefore, the transconductance of is .
Comment
The expression for the transconductance is,
Here, is the amount of current flowing into the drain of .
The amount of current that flows into the drain of is I.
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4/28/2021 Solved: Chapter 11 Problem 65P Solution | Microelectronic Circuits 7th Edition | Chegg.com
https://www.chegg.com/homework-help/microelectronic-circuits-7th-edition-chapter-11-problem-65p-solution-9780199339136 2/6
Substitute for and 0.2 for .
Therefore, the transconductance of is .
Comment
The expression for of is,
Substitute 16 V for , and 0.4 mA for .
The value of of is .
Comment
The expression for of is,
Substitute 16 V for , and 0.4 mA for .
The value of of is .
Comment
(c)
Draw the circuit as shown in figure 1.
Comment
Determine the gain A.
Consider the following expression:
 …… (2)
Apply Nodal analysis at node-X.
Apply Source transformation technique at node-Y and determine .
Substitute for .
 …… (3)
Comment
Determine .
Apply Voltage-division principle at the output node and obtain .
 …… (4)
Recall equation (3).
Substitute the above expression for in equation (4).
 …… (5)
Therefore, the expression for A is,
.
Comment
(d)
Draw the feedback circuit for as shown in figure 2.
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4/28/2021 Solved: Chapter 11 Problem 65P Solution | Microelectronic Circuits 7th Edition | Chegg.com
https://www.chegg.com/homework-help/microelectronic-circuits-7th-edition-chapter-11-problem-65p-solution-9780199339136 3/6
Comment
Determine the relation between and .
Apply Kirchhoff’s voltage law to the circuit shown in figure 2.
 …… (6)
The expression for is,
Consider equation (6). Substitute the expression for .
Therefore, the feedback factor is .
Comment
The expression for loop gain is,
 …… (7)
Therefore, the expression for loop gain is .
Comment
The expression for the amount of feedback is,
 …… (8)
Therefore, the expression for the amount of feedback is,
.
Comment
(e)
Consider the following expression:
 …… (9)
Recall equations (5) and (8).
Substitute the above expressions in equation (9).
Therefore, the expression for is .
Comment
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4/28/2021 Solved: Chapter 11 Problem 65P Solution | Microelectronic Circuits 7th Edition | Chegg.com
https://www.chegg.com/homework-help/microelectronic-circuits-7th-edition-chapter-11-problem-65p-solution-9780199339136 4/6
(f)
Refer to figure 1.
Determine the resistance .
Therefore, the expression for , is .
Comment
Refer to figure P11.65 given in the textbook.
Determine the resistance .
 …… (10)
Comment
Recall equation (8).
Substitute the above expression in equation (10).
Therefore the expression for is .
Comment
Determine the resistance .
Therefore, the expression for , is .
Comment
Refer to figure P11.65 given in the textbook.
Determine the resistance .
 …… (11)
Recall equation (8).
Substitute the above expression in equation (11).
Therefore, the expression for is, .
Comment
(g)
Reca1l equation (5).
Substitute for and ; and for , and for and .
Therefore, the value of A is .
Comment
Consider the following expression:
Substitute for .
Therefore, the value of is .
Comment
Recall equation (7).
Substitute for and ; and for , and for and .
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4/28/2021 Solved: Chapter 11 Problem 65P Solution | Microelectronic Circuits 7th Edition | Chegg.com
https://www.chegg.com/homework-help/microelectronic-circuits-7th-edition-chapter-11-problem-65p-solution-9780199339136 5/6
Recommended solutions for you in Chapter 11
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Therefore, the value of is .
Comment
Consider the following expression:
Substitute for and ; and for , and for and .
Therefore, the value of is .
Comment
Consider the following expression:
Substitute for .
Therefore, the value of is .
Comment
Consider the following expression:
Substitute for , for , and for .
Therefore, the value of is .
Comment
Consider the following expression:
Substitute for and ; and for , and for and .
Therefore, the value of is .
Comment
Consider the following expression:
Substitute for and ; and for , and for and ;
and for .
Therefore, the value of is .
Comment
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2 8
Chapter 11, Solution 31P
(a) Refer to Figure
P11.31 in the textbook.
Consider the closed loop
gain is . Determine the
value of . …… (1)
Replace...
See solution
Chapter 11, Solution 97P
Consider the open loop
gain the amplifier with
three poles. …… (1)
Here, is low-frequency
gain, and are poles.
See solution
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4/28/2021 Solved: Chapter 11 Problem 65P Solution | Microelectronic Circuits 7th Edition | Chegg.com
https://www.chegg.com/homework-help/microelectronic-circuits-7th-edition-chapter-11-problem-65p-solution-9780199339136 6/6
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