
The op−amp in the difference amplifier configuration in Figure P14.60 isideal. (a) If the tolerance of each resistor is ± 1.5%, determine the minimum value of
Figure P14.60
a.

Minimum value of
Answer to Problem 14.60P
Explanation of Solution
Given:
The given difference amplifier circuit is shown below.
Tolerance of each resistor is
Calculation:
Circuit with voltage and resistance notation is,
KCL at
As op-amp is ideal, so
KCL at
Now put
Now,
If
For
For
Now,
For minimum CMRR maximize the denominator i.e.
and
Therefore,
So, minimum value of
b.

Minimum value of
Answer to Problem 14.60P
Explanation of Solution
Given:
The given difference amplifier circuit is shown below.
Tolerance of each resistor is
Calculation:
For tolerance of resistor
As,
For minimum CMRR maximize the denominator that is,
and
Putting the value in equation (3),
So, minimum value of
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Chapter 14 Solutions
Microelectronics: Circuit Analysis and Design
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