Concept explainers
The circuit in Figure P9.65 is a representation of the common-mode and differential-input signals to a difference amplifier. The output voltage can bewritten as
(a) Setting
(b) Determine
(a)
To show: The expression for the common mode gain is
Explanation of Solution
Calculation:
The given diagram is shown in Figure 1.
The expression for the voltage
The expression for the value of the voltage
The expression for the value of the voltage
The expression for the voltage
Apply KCL at the inverting terminal.
Substitute
Substitute
The expression for the output voltage is given by
Substitute
Substitute
Conclusion:
Therefore, theexpression for the common mode gain is
(b)
The value of common mode voltage gain.
Answer to Problem 9.65P
The value of the common mode voltage gain is
Explanation of Solution
Calculation:
The expression for the value of common voltage gain is given by
Substitute
Conclusion:
Therefore, the value of the common mode voltage gain is
(c)
The value of common mode voltage gain.
Answer to Problem 9.65P
The value of the common mode voltage gain is
Explanation of Solution
Calculation:
The expression for the value of common voltage gain is given by
For
Substitute
Conclusion:
Therefore, the value of the common mode voltage gain is
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Chapter 9 Solutions
Microelectronics: Circuit Analysis and Design
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