a)
i. Define what a slew rate (SR) is
ii. The SR in general describes the degradation effect on the high frequency
response of the active amplifier (one with an op amp) near or at the rated maximum
output voltage swing. This effect is generally due to the compensating capacitor and not
to the transistor circuits internal to the op amp to charge. Write a formula for the current required capacitor.
iii. With help of formula in a (ii), give now the formula for SR.
(b) Suppose that an op amp has a maximum output current of 1 mA. If the compensating
capacitor is 1000 pF. Calculate the SR.
(c) Suppose that the input signal to a 741-based unity gain amplifier configuration
is a 20kHz sine wave. What is the largest possible amplitude of the input signal to
avoid distortion due to slewing?
3.
(a) Give six (6) characteristics of ideal operational amplifier.
(c) What is a common-mode Rejection Ration (CMRR)?
Hence give a formula for CMRR.
4.
(a) An op amp has an open loop gain of 106 and if both inputs are earthed, the output voltage is 1v. Determine the output voltage V0 if the op amp is used in the circuit below.
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