Download AKTU B-Tech 5th Sem 2017-2018 NEC501 Integrated Circuits Question Paper

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Printed pages: 2

Paper Id: 3049

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Sub Code: NEC501

Time: 3 Hours

Roll No:

B TECH

(SEM 5) THEORY EXAMINATION 2017-18

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INTEGRATED CIRCUITS

Total Marks: 100

Note :- All sections are compulsory. If require any missing data; then choose suitably.

SECTION - A

1. This question consist of short answer questions. Attempt all parts of this question. All parts carry equal marks.
   

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   2 X 10 = 20
   1. If the open loop gain of an operational amplifier is very large. Does the closed loop gain depend upon the external components or the operational amplifier justify
   2. What is meant by the term matched transistors.
   3. Define and give significance of Slew Rate.
   4. What is a Super Diode.
   5. Give two application of analog multiplier.

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   6. What do you mean by a frequency response of a filter circuit.
   7. Differentiate between Comparator and Schmitt trigger.
   8. Describe the need of voltage limiter circuits.
   9. The basic step of a 8-bit DAC is 20mV. If 00000000 represents 0V, what is represented by the input 10110111.
   10. What do you mean by a CMOS circuit logic.

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SECTION – B

2. Attempt any Three parts of this question. All parts carry equal marks.
   10 X 3= 30
   1. What are the desirable characteristics of current mirror circuits. Explain the circuit of Wilson MOS current mirror. Also discuss how it can be improved.
   2. Derive the expression of voltage gain in KHN Biquad Filter. Draw the KHN Biquad filter and drive transfer function of the BPF and LPF from that.

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   3. Discuss the features of CMOS circuit. Realize one AND-OR-INVERT (AOI) and one OR-AND-INVERT (OAI) function using CMOS logic circuit.
   4. What do you mean by the quadrant operation of multiplier. Draw and explain a GILBERT analog multiplier.
   5. Draw the block diagram of a PLL and explain its operation. Explain lock-in-range, capture range and pull-in time of a PLL. List the application of PLL.

SECTION - C

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3. Attempt any Two parts of each questions of this section. All question carry equal marks
   10 X 5 = 50
   1. Describe the operation and characteristics of a BJT complementary push-pull output stage.
   2. Determine the small-signal model of the second stage of the 741 op-amp.
   3. The parameter of the three transistor CM are Vcc = 9V, VEE = 0, R1=12?O, VBE(on) = 0.7V, ß = 75, VA = 8. Calculate the value of current, Iref, Io, IC1, IB1, IB2, IB3, IE3.

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4. 1. Draw the generalized impedance converter and derive its impedance equation. Also simulate an Inductor.
   2. Derive the output expression for RC Phase Shift Oscillator.
   3. Compare and contrast active filters and passive filters. Design a second order low pass Butterworth filter to have cut-off frequency of 1KHz.
5. 1. Give CMOS implementation of a SR flip-flop and explain its working.

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   2. Give two different CMOS realization of the Exclusive – OR gate function in which the PDN and PUN are dual networks..
   3. Discuss D-F/F circuit using NAND CMOS gates.
6. 1. Draw & explain the circuit of triangular wave generator. How square wave can be obtained using this triangle wave.
   2. Describe temperature compensated Log amplifier using two op-amp & explain its operation.

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   3. Explain how a Schmitt Trigger circuit works with a neat diagram. Design an Schmitt trigger with VUT = 2V, VLT = -1V. Assume + Vsat = 13V.
7. 1. Draw and Explain the block diagram of IC 555.
   2. Explain the operation of dual slope ADC.
   3. Design a 555 timer as astable multivibrator giving its block diagram which provide an output signal frequency of 2 KHz and 75 % duty cycle.

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