Download 4 ES46 LINEAR IC`s AND APPLICATIONS

SRI S1DDHARTHA INSTITUTE OF TECHNOLOGY, TUMKUR.
S U M M E R B.E., S E M E S T E R END E X A M I N A T I O N S - A U G U S T 2013.
ES46 : LIN EA R IC ’s AND A P P L I C A T I O N S
TIME: 3.00 Hrs
1 .a
SEM: IV
MAX MARKS: 100
Define the following terms with respect to operational amplifiers
08
(i) Output impedance (ii) Slew rate (iii) CMRR (iv) Input oiTset voltage
Design a differential amplifier for a gain o f 37. Each input has an amplitude of approximately
50mV.Using LF353 op-amp design a suitable circuit and calculate the differential and common
mode input resistances.
06
With a neat circuit diagram explain direct coupled non-inverting amplifier with necessary
design steps.
06
OR
Explain the working of basic op-amp with a neat diagram.
08
Sketch and explain a typical gain Vs frequency graph for an op-amp.
04
Design a non-inverting amplifier to provide a gain o f 50 for an input o f 1OOmV.Compute its
input and output impedance. Given R, = 2MQ. Ib(Mu\> _ 500nA and M ^xlO '*1 .
08
Sketch the circuit o f a capacitor coupled inverting amplifier using a single polarity supply.
Briefly explain the operation.
06
b
Sketch and explain a circuit to show the Zin Mod method o f frequency compensation.
08
c
Design a capacitor coupled voltage follower using IC741 op-amp. The lower cutoff frequency
for the circuit is to be 1001 Iz and the load resistance is 4.7KX2. Draw' the circuit and explain the
operation.
OR
Explain the operation o f high Z m voltage follower based AC amplifier. Prove that Zin is very
large ideally.
06
A capacitor couplcd non-inverting amplifier is to have a +24 V supply, a voltage gain o f 100, an
output amplitude of 5V. alower cutoff frequency o f 75Hz and a minimum load resistance of
5.6KQ. Using 741 op-amp design a suitable circuit. Given iB(Max) = 500nA.
10
Define slew rate. Calculate the cutoff frequency limited rise time for a voltage follower circuit
using a 741 op-amp. Also determine the slew rate limited rise lime if the output amplitude is to
be 5V. Given S=0.5V/^S , f> = 800KHz.
04
Draw the circuit of'an instrumentation amplifier. Derive an expression for the gain.
08
Design a voltage source to provide a constant output voltage o f 6Vusing Zener diode
V/=6.3V.The load resistance has a minimum value o f 150Q and the available supply voltage is
±12V. Assume Iz =~ 20mA.hfc(mul) = 20. IclmaM> 42mA and V e i lma\) > V(v. Draw the circuit.
Explain the operation o f saturating precision half wave rectifier
08
2.a
b
3.a
4.a
b
5.a
b
6.a
b)
OR
Design a precision full wave rectifier to produce a 2V peak output from a sine wave input with
a peak value of 0.5V and a frequency of 1MI IZ. Use bipolar op-amps with a supply voltage o f
± 15 V
Wha: i s d e a d zone circuit? Explain
06
04
08
04
c)
Skctch a precision peak detector circuit. Draw the input and output waveforms and explain the
circuit operation. Write the equations for calculating the capacitor value for a peak detector
circuit. Give the equations lor op-amp minimum slew rate
08
Explain the working of capacitor coupled crossing detector
06
b)
Using a 741 op-amp with a supply o f ±12V Design a phase shift oscillator to have an output
frequency o f 3.5KHz. Given lB(ma\)= 500nA
08
c)
Using a BIFET op-amp with a supply of ± 12V design a Wein bridge oscillator to have an
output frequency o f 15 KHz.
06
7.a)
8.a)
b)
OR
Explain the operation o f an inverting Schmitt trigger circuit with different UTP and LTP
voltages with the help of suitable c irc u it. Discuss the design procedure for components used.
Also indicate the input and output characteristics for the inverting Schmitt trigger circuits.
Design a second order high pass* active filter to have a cutoff frequency o f 12KHz. Use a 715
op-amp. Given I»(niax) “ 1 .5 \x A .
10
10
9.a)
Explain the working o f 555 timer as a a astable multivibrator
08
b)
c)
Define lock-in range and capture range with reference to PEE
Explain A/D converters
04
08
OR
10.a)
Draw the block diagram o f PEL and explain
b)
Briefly explain the working o f 4-bit binary weighted resistor DAC
c)
Explain the working o f monostable multi vbrator using 555 timer
06
*
06
08
Common for:
EC, TCE, ML