Jawaharlal Nehru Technological University Kakinada 2008 B.Tech Electronics and Communications Engineering LINEAR IC APPLICATIONS - Question Paper

8. (a) elaborate the various kinds of multiplexers? discuss logic diagram and truth
table of Dual four to one line multiplexer.
(b) discuss the operation of balanced modulator using neat sketch. [10+6]
? ? ? ? ?
2 of 2
Code No: R05310401 Set No. 2
III B.Tech I Semester Supplimentary Examinations, February 2008
LINEAR IC APPLICATIONS
(Electronics & Communication Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
? ? ? ? ?
1. (a) discuss cascade connection of differential amplifier for active load.
(b) Write the properties of various configurations of differential amplifier. [8+8]
2. (a) calculate the maximum possible total output voltages in the amplifier circuits
shown in figure 2. The op - amp is the MC1536 with the subsequent specifica-
tions:
Vio = 7.5mV maximum; Iio = 50nA maximum; IB = 250 nA maximum at TA
= 250C.
(b) discuss the difference ranging from the slew rate and the transient response.
(c) Briefly discuss the need for compensating networks in op - amps. [4+6+6]
Figure 2
3. (a) obtain V0 for the circuit shown in figure 3
(b) obtain R1 and Rf in the practical integrator (lossy integrator), so that the peak
gain is 20 dB and the gain is three dB down from its peak when ? = 10,000
rad/sec. Use a capacitance of 0.01µF. [8+8]
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Code No: R05310401 Set No. 2
Figure 3
4. Design and discuss a saw tooth waveform generator using operational amplifier
and plot the waveforms for the provided specifications frequency = 5kHz, Vsat = ±12
Volts. [16]
5. (a) Design a 4th order Butterworth low pass filter whose bandwidth is 1kHz.
choose all capacitors equal to 1000nF.
(b) discuss the operation of narrow band pass filter and find the frequency
response. [8+8]
6. (a) Draw the block schematic of a PLL describing the function of every block
briefly.
(b) What is the purpose of low pass filter in a phase locked loop? define various
kinds of low pass filters used in PLL. [8+8]
7. (a) elaborate the basic blocks preceding an Analog to Digital converter in a typical
application like digital audio recording?
(b) Draw the circuit of weighted resistor DAC and derive expression for output

Earning:   Approval pending.