Question

a) Explain the main limitations of an operational amplifier to be used as a comparator. b) An AC triangular waveform with peak values of+3V is used as an input to

a comparator. The outputs of the comparator are VoH= 5V, VOL= - 5V Draw a waveform of the output of the(i)comparator when an inverting circuit isused.(5 Marks) (ii)comparator when an inverting circuit withan offset of +2V is used.Draw a waveform of the output of the ) Design a Schmitt trigger with a hysteresis band of±0.5V. The outputs of the Schmitt trigger areVOH=5V, VOL=-5V. The resistance value of the resistor in the positive feedback is 1MQ. Draw the circuit diagram of a Schmitt trigger of an inverting circuit and determine the resistance of the resistor connected to the input.i) ii)Draw the hysteresis characteristic of the Schmitt trigger indicating Upper Triggering point, Lower triggering Point,saturate voltages, input voltage andoutput voltage.(5 c) Design a Schmitt trigger with a hysteresis band of±0.5V. The outputs of the Schmitt trigger areVoH=5V, VOL=-5V. The resistance value of the resistor in the positive feedback is 1MQ.

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