Unit 5 - Operational Amplifiers

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1 X Courses» Integrated Circuits, MOSFETs, OP-Amps and their Unit 5 - Amplifiers Announcements Course Ask a Question Progress Mentor Course outline Introduction to IC Technology Introduction to IC Technology Introduction to Technolgy Introduction to Technolgy Amplifiers MOSFETs and (Current Mirrors) Introduction to Amplifiers Amplifier Amplifier Contd of an Contd A project of Quiz : Week 5 Assignment 5 Assignment 5 - Solutions Week 5 Assignment 5 The due date for submitting this assignment has passed. Due on , 23:59 IST. Submitted assignment 1) According to the principle of current mirror, if gate-source potentials of two identical MOS transistors are equal, then the drain currents should be None Equal Both Different Equal 2) An ideal op-amp has Infinite input resistance Infinite differential voltage gain Zero output resistance All of the above All of the above 3) For an op-amp having a slew rate of 6V/ µs, calculate an undistorted peak-peak output voltage for an input sine wave of 2 MHz frequency. 1.5 V 3 V 2014 NPTEL - Privacy & Terms - Honor Code - FAQs V In association with 0.95V Funded by 1 of 6 Wednesday 16 May :50 PM

2 Understanding Data Sheet Experiments on Experiments on Configarations Experiments on Op-amp Experiments: Op-amp as Filters DOWNLOAD VIDEOS Powered by 0.95V 4) An inverting op-amp has an open-loop voltage gain and closed-loop voltage gain of 100,000 and 30 respectively. If an op-amp with an open-loop voltage gain of 300,000 is substituted in the arrangement, the closed-loop gain.. Doubles Remains at 30 Increases slightly Drops to 15 Remains at 30 5) Which among the following gate can be implemented by the circuit shown NOR NAND NOT AND NOR 6) Find Vo for the circuit shown -8.9 V 11.2 V V 8.9 V No, the answer is incorrect V 7) Consider R1= 10 kω, Rf = 100 kω, V1=1.5V and V2= 2.5 V. Compute Vo 2 of 6 Wednesday 16 May :50 PM

3 -15 V -20 V 10 V 25 V 10 V 8) Consider an op-amp with a gain of -25 using resistors not smaller than 1 kω 3 of 6 Wednesday 16 May :50 PM

4 9) A differential amplifier shown below has a differential gain of 100 and a CMRR of 40 db. If V1 = 0.6 V and V2 = 0.4 V calculate the output voltage V 20 V 15 V V 20.5 V 10) M1, M2 and M3 in the circuit shown below are matched N-channel enhancement mode MOSFETs operating in saturation mode, forward voltage drop of each diode is 0.7 V, reverse leakage current of each diode is negligible and the op-amp is ideal. The current Is in the circuit is 1 ma 2 ma -1 ma 0.5 ma No, the answer is incorrect. 0.5 ma 11) For the circuit shown, find the CMRR in db Zero ) What should be the value of R1 in the circuit shown to be able to produce a voltage gain of 10 2 kω 8 kω 11 Ω 4 of 6 Wednesday 16 May :50 PM

5 1 kω 2 kω 13) What is the relation between Iref and Iy? Iy = 0 Iref = Iy Iref > Iy Iref < Iy Iy = 0 14) A multistage amplifier is as shown in figure. Find out the values of Iref and Ix if Iy = 1 ma Iref = 1.5 ma and Ix = 1.5 ma Iref = 1 ma and Ix = 1.5 ma Iref = 0.5 ma and Ix = 0.5 ma Iref = 0.5 ma and Ix = 1.5 ma Iref = 0.5 ma and Ix = 1.5 ma 15) Compute (W/L)1 for the circuit shown, if the output Io is to be 6 ma. Consider Iref = 1 ma and (W/L)2 = Previous Page End 5 of 6 Wednesday 16 May :50 PM

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