Download a) Integrated Circuits Question Bank

Integrated Circuits
Unit 1
1. What is current mirror? Derive the current transfer ratio of basic current mirror circuit using
BJT.
2. Sketch the circuit diagram of base current compensated current mirror also derive its
expression.
3. What is short circuit protection circuit? How it is achieved in O/P stage of 741 Op-Amp.
4. If emitter base area of transistor Q2 is N time that of Q1 of a simple current mirror then find its
current transfer ratio.
5. Sketch the widlar current source & explain its operation.
6. Derive the current transfer ratio of MOS current mirror circuit in term of (W/L) ratio.
7. Discuss the DC analysis of first stage 741 Op-Amp. Find the value of bias current of each
transistor.
8. Discuss how we can improve the CMRR of differential amplifier by using current mirror
circuit.
9. What is MOS current steering? Derive expression for its current transfer ratio.
10. Consider an N o/p current mirror. Assume all transistor are matched & have finite β. Show
that
IO = IREFβ/(1+N+β)
11. Discuss the small signal analysis of second stage of 741 Op-Amp. Find the equation of
input resistance, output resistance & transconductance, also draw its small signal equivalent ckt .
12. Sketch the small signal equivalent ckt of 741 IC Op-amp. Write down the equation for
overall voltage gain.
13. Draw ckt diagram of Wilson current source using BJT & find out its current transfer ratio.
14. Explain instrumentation amplifier using 3 op amps. Also find its gain.
15. Discuss the frequency response of 741 Op-Amp. Also find the relation between unity gain
bandwidth and slew rate.
16. Sketch the widlar current source & explain its operation.
17. What is MOS current steering? Derive expression for its current transfer ratio.
18. Perform the dc analysis of o/p stage of 741.
19. If emitter base area of o/p transistor is m time that of I/p then finite its transfer
ratio.
20. Derive relation for slew rate & bandwidth of 741.
21. Draw the small signal equivalent of 741 and find its overall gain.
22. What is difference between active load & passive load?
23. Why we use current mirror circuit.
24. What is role of feedback connected capacitor in 741.
Unit 2
1. Draw & explain three op- amp instrumentation amplifiers. Also derive the expression of
voltage gain.
2. Draw & explain V-I converter. Derive its o/p voltage equation for both floating load &
grounded load.
3. What is generalized impedance converter (GIC) & derive its input impedance equation.
4. How we can simulate inductor using GIC. Also draw the modified structure.
5. What is filter? How can we classify them and also explain difference between active filter and
passive filter.
6. Explain the following term
(a) Frequency response
(b) Roll-off rate
7. Design a second order butter worth low pass filter having cut off frequency of 10 KHz.
8. Design a high pass filter having a cut off frequency of 1 KHZ with pass band gain of 2.
9. Draw & explain narrow band reject filter. Find its transfer function.
10. Derive the expression of voltage gain in KHN biquad filter.
11. What is oscillator, explain its basic principle & also find expression for
criteria of sustained oscillation.
barkhausen
12. Derive the expression for frequency of oscillation of a RC phase shift oscillator using OpAmp.
13. What is barkhausen criteria, derive its relation
14. What is difference between phase shift and wein bridge oscillator
16. What is filter, what are various type of filter
17 draw the frequency response of LPF & HPF
18. Design LPF of first order with pass band gain of 5 & cut off frequency of 10.
19. Find the equation for gain &phase of first order LPF.
20. What is oscillator, discuss its transfer equation.
21. What is KHN filter.
22. What is state variable filter.
23. Simulate inductor using GIC.
24. Why we use second order filter in place of first order.
25. What is notch filter? Derive its transfer function.
Unit 3
1. Explain various parameter of logic family.
2. Design CMOS inverter. What is various advantages of CMOS invertors.
3. Implement Two I/P NAND gate & explain the operation.
4. Draw D flip flop & explain simple model of D flip flop.
5. Implement Two I/P NOR gate & explain the operation.
6. Sketch logic gate symbolic representation of clocked SR flip flop using NOR gate. Also
sketch its CMOS circuit implementation & explain its operation.
7. Implement Two I/P OR gate & explain the operation of the following
8. Draw D flip flop using CMOS. Also draw & explain its master slave configuration.
9. Implement Two I/P AND gate & explain the operation.
10. Implement Two I/P Xor gate & explain the operation.
14. Explain in detail the operation of CMOS. Also draw its VTC.
15. Implement A+BC using CMOS.
16. Write a short note on transistor sizing.
17. What is effect of fan in & fan out on propagation delay.
18. Implement SR flip flop using CMOS.
19. Implement D flip flop by inverter & pass transistor.
20. Explain working of master slave D flip flop using CMOS.
21. Write a short note on PUN & PDN.
22. Define propagation delay & rise time.
23. Implement three inputs OR gate using CMOS.
24. Power dissipation of CMOS is very low, justify the statement
25. Sketch the logic gate symbolic representation of clocked SR flip flop using NAND gate &
explain its operation.
UNIT 4
1.
2.
3.
4.
5.
6.
7.
Draw & explain operation of log
amplifier. How temperature compensation is achieved in log amplifier.
What is precision rectifier? Explain
operation of half wave precision rectifier with necessary waveform
Draw & explain operation of square wave
generator.
Draw & explain operation of triangular
wave generator using Op-Amp.
Write a short note on
(a)
Op-Amp as a comparator
(b)
Analog multiplier
Explain op-amp as a Schmitt trigger.
What is multivibrator? Explain operation
of astable multivibrator.
8.
Design a Schmitt trigger for VTH = 0.5V
& VTL= -0.5V.
9.
Find frequency of oscillation of astable
multivibrator if R1=10 KΩ, R2=16KΩ, RF=62KΩ & C =10Nf.
10.
Design mono stable multivibrator using
op-amp.
11.
Draw the circuit diagram of antilog
amplifier using op-amp and drive the expression for output voltage.
12.
Draw the circuit diagram of a
temperature compensated antilog amplifier and drive the expression for output voltage.
13.
What is the super diode? Draw the circuit
of precision full wave rectifier and deduce the transfer characteristics.
14.
Explain the operation of an op-amp
comparator and Draw the transfer characteristic.
15.
write a short note on Sample & hold
circuits
16.
Explain Peak detector.
17.
What is anti log amplifier, & how it can
be compensated?
18.
What is UTL & LTL?
19.
Write a short note on hysteresis voltage.
20.
Implement
multiplier
using
log
amplifier.
UNIT 5
1 Design a 4-bit D/A convertor using binary weighted resistor, also derive its output expression.
2. Explain operation of R-2R ladder type DAC.
3. Write a short note on the following(a) Dual slop A/D convertor
(b)
Flash type A/D convertor.
(c) Lock range in PLL.
(d)
Capture range in PLL.
4. Explain operation of 555 timer a mono stable multivibrator.
5. What is PLL? What is its various applications?
6. Why does the dual slope ADC provide excellent noise rejection of AC signal whose periods
are integral multiples of the integration time?
7. Define following performance parameters of D/A converters:
a) Resolution
(b) Accuracy
c) Monotonicity
d) Conversion time
8. Explain the operation of basic sample and hold circuit
9. State the advantages and applications of sample and hold circuits.
10. The basic step of a 9 bit DAC is 10.3 mV. If 000000000 represents 0Volts, what
output for an input of 101101111.
11. Draw & explain the analog voltage multiplier.
12. Drive the expression of time delay for monostable multivibrator using IC555.
13. What are the advantages and disadvantages of R-2R ladder DAC?
14. What is the difference between direct ADC and integrating type ADC?
15. Define voltage to frequency conversion factor of VCO.
16. Mention the applications of analog multipliers.
17. Explain how a frequency doubler can be realized using analog multiplier.
is the
18. Define voltage to frequency conversion factor of VCO.
19. Define the following terms related to PLL,
a) Capture range
b) Lock range
20. Write on frequency synthesizers.
21. What is the duty cycle? Drive the expression for the duty cycle of an astable multivibrator.
22. Draw & explain the block diagram of the PLL system.
23. What is the role of phase accumulator in frequency synthesizer?
24. What is the phase comparator/detector?