Concept explainers
For the PMOS common−source circuit shown in Figure P769, the transistor parameters are:
Figure P7.69
(a)
The upper
Answer to Problem 7.69P
The upper
Explanation of Solution
Given:
The given circuit is shown below.
Calculation:
Calculate the gate voltage
Substitute
The expression for drain current
Substitute 10 for
Consider the another expression for drain current
Equate equations (1) and (2)
Calculate source-to-gate voltage
Calculate transconductance
Substitute
Calculate the Miller Capacitance.
Substitute
Calculate the time constant
Where
Recall equation (3).
Substitute
Calculate the upper 3 dB frequency
Therefore, the upper
(b)
The value of the Miller capacitance
Answer to Problem 7.69P
The value of the Miller capacitance is
Explanation of Solution
Given:
The given circuit is shown below.
Calculation:
Calculate the gate voltage
Substitute
The expression for drain current
Substitute 10 for
Consider the another expression for drain current
Substitute
Equate equations (1) and (2)
Calculate source-to-gate voltage
Calculate transconductance
Substitute
Calculate the Miller Capacitance.
Substitute
The value of the Miller capacitance is
(c)
The mid-band voltage gain.
Answer to Problem 7.69P
The mid-band voltage gain is
Explanation of Solution
Given:
The given circuit is shown below.
Calculation:
Draw the small-signal model of the circuit shown in figure
Determine the expression for output voltage
Apply the voltage division principle.
Determine source-to-gate voltage
Substitute
Substitute
Therefore, the expression for the mid-band voltage gain is,
Substitute
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Chapter 7 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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