a.
Effective resistance
a.
Answer to Problem 14.40P
Value of effective resistance
Explanation of Solution
Given:
Bipolar diff-amp with active load and a pair of offset-null terminal is shown below.
Given parameters are:
Wipe arm of potentiometer is exactly at center.
Calculation:
As wipe arm of potentiometer is exactly at center. So,
As
So,
b.
Values of
b.
Answer to Problem 14.40P
Value of
Explanation of Solution
Given:
Bipolar diff-amp with active load and a pair of offset-null terminal is shown below.
Given parameters are:
Calculation:
Now, KVL between terminals of
Here,
Now, on including the effect of potentiometer
The base emitter voltages are,
And
Substituting values from equation (4) and (5) in equation (1)
Now, substituting value from equation (2) and (3) in above equation,
Substituting the values
So,
Since,
So, to compensate the mismatches of transistor the value of
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Chapter 14 Solutions
Microelectronics: Circuit Analysis and Design
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