
Concept explainers
The maximum and minimum output voltage in the MC14573 circuit such that op-amp remains biased in its linear region.

Answer to Problem 13.10TYU
The input common mode voltage range for the MC14573 op-amp is
Explanation of Solution
Given:
Following is given circuit of the MC14573 op-amp equivalent circuit
Given data,
The transistor parameters are
And the circuit parameters are
The given width to length ratio of
Calculation:
For transistors
Hence,
Now assuming the transistor
currents are given as
We know that the reference current and source to gate voltage is also related by
Now combining equation (1) and (2) yields the source to gate voltage of
Using quadratic equation,
Hence,
Now from equation (1) we have
The reference current is
Similarly, the source to gate voltage of
We know that
Therefore, the source-to-drain saturation voltage is
Now the maximum input voltage is given as
Therefore, the maximum input voltage is
Now for transistor
Therefore,
Now
Where
Now
Therefore, the source-to-gate voltage of
We know that
Therefore, the source-to-drain saturation voltage is
Now the minimum input voltage is given as
Therefore, the minimum input voltage is
The input common mode voltage range for the MC14573 op-amp is
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Chapter 13 Solutions
Microelectronics: Circuit Analysis and Design
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