Concept explainers
The circuit and transistor parameters for the source−follower amplifier shown in Figure 4.29 are
Figure 4.29 Figure for Exercise Ex 4.8
(a)
The value of width to length ratio of MOSFET.
Answer to Problem 4.8EP
Explanation of Solution
Given Information:
The given circuit is shown below.
Calculation:
The coupling capacitor acts like open circuit for DC value calculation.
The modified figure is:
From the circuit:
Hence, transistor operates in saturation region.
The expression of drain current is:
(b)
The value of small signal voltage gain.
Answer to Problem 4.8EP
Explanation of Solution
Given Information:
The given circuit is shown below.
Calculation:
The value of
The coupling capacitor acts like short circuit for AC value calculation. The DC voltage source is short circuited.
The modified figure is:
The value of output voltage is:
Applying Kirchhoff’s voltage law from input to output:
From equation (1):
Plugging the values:
(c)
The value of load resistance
Answer to Problem 4.8EP
Explanation of Solution
Given Information:
The given circuit is shown below.
Calculation:
The new value of voltage gain is:
The value of load resistance is determined as follows:
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Chapter 4 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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