Test: Large Signal Operations on Operational Amplifiers - Electronics and Communication Engineering (ECE) MCQ

The full-power bandwidth, f_M, is the maximum frequency at which

 Which of the following is not limitation of the operational amplifier

 A particular op amp using ±15-V supplies operates linearly for outputs in the range −12 V to +12 V. If used in an inverting amplifier configuration of gain –100, what is the rms value of the largest possible sine wave that can be applied at the input without output clipping?

For operation with 10-V output pulses with the requirement that the sum of the rise and fall times represent only 20% of the pulse width (at half amplitude), what is the slew-rate requirement for an op amp to handle pulses 2 µs wide? (Note: The rise and fall times of a pulse signal are usually measured between the 10%- and 90%-height points.)

An op amp having a slew rate of 20 V/µs is to be used in the unity-gain follower configuration, with input pulses that rise from 0 to 3 V. What is the shortest pulse that can be used while ensuring full-amplitude output?

(Q.9-Q.10) In designing with op amps one has to check the limitations on the voltage and frequency ranges of operation of the closed-loop amplifier, imposed by the op-amp finite bandwidth (f_t), slew rate (SR), and output saturation (V_{o max}). Consider the use of an op amp with ft_t = 2 MHz, SR = 1 V/µs, and V_{0 max} = 10 V in the design of a non-inverting amplifier with a nominal gain of 10. Assume a sine-wave input with peak amplitude Vi.

Q. If Vi = 0.5 V, what is the maximum frequency before the output distorts?

 If f = 20 kHz, what is the maximum value of V_i before the output distorts?