Question

Which Among the following are the major responsible reasons for the cause of Slew Rate?
A. Current limiting
B. Saturation of internal stages due to application of high frequency and amplitude signal
C. Both A and B
D. None of the above

Answer 1

To answer this question, we must know about the term Slew Rate i.e., the slew rate of an operational amplifier is defined as the highest rate of change of its output voltage in volts per microsecond. It is determined by introducing a large signal step to the op amp's input and monitoring the rate at which the output signal's amplitude changes.

Complete Step By Step Answer:
Slew rates are also known as output voltage swing as a function of frequency or large signal pulse response of a voltage follower.
The maximum rate of change of output voltage with respect to time is known as the slew rate. Let us take an example, if 1V/microseconds be the slew rate, 1V/microseconds will be the output of rise or fall at the speed rating. In addition, the slew rate is inversely proportional to temperature. The slew rate reduces as the temperature rises.
Because slew rate is a significant signal phenomena, current limitation and saturation of the op-intrinsic amp's stages play a larger role in the causes of slew rate. When a frequency and amplitude signal is applied, however, the resulting current is also high enough to charge the capacitance compensation network.
Because charging and discharging a capacitor takes a finite amount of time, the internal capacitors are exclusively responsible for preventing the output voltage from responding instantly to the rapidly changing input.
As a result, the current limitation in slew rate is affected by capacitor charging rate, indicating that the voltage across the capacitor is the output voltage.
From the above we can easily conclude that option C is the correct option.

Note:
If any student does not understand the relationship between an amplifier's time delay, input voltage, and slew rate. The input voltage is measured in volts, while the slew rate is measured in volts per microsecond. As a result, if we divide the input voltage by the slew rate, the volt will be cancelled in the division, and the microsecond will be added to the numerator, giving us a response in microseconds, which is a unit of time, time difference, or delay.