Download Advance electroncis Assignment Question

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GTU EXAMINATION QUESTIONS
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Chapter 7: Analog To Digital And Digital To Analog Converters:
Calculate the values of resistors and reference voltage if resolution required
is 0.5 V for 4-bit R/2R ladder type DAC.
Using an OP-AMP, draw the functional diagram of a successive
approximation ADC and explain its working.
What is Analog to Digital convertor ? List the types of Analog to Digital
convertor used. Explain the Successive Approximation Analog To Digital
Convertor.
What is Digital to Analog Convertor ? Draw and Explain R-2R DAC ? Also
give the advantages and disadvantages of R-2R Digital to Analog convertor.
Mention the types of ADC and describe successive approximation type of
ADC.
Solve the examples :
(1)Calculate the analog output of the 4-bit DAC if digtal output is 1011
assume Vfs=5volt
(2)5-bit R-2R ladder network with 0=0volt and 1=10V Find (1)Analog
output due to LSB change (2)Full scale output voltage
Chapter 6 : Logic Family
Give the comparison between various logic families.
Define following parameters.
I) Fan-out,
II) Propagation delay,
III) Speed power product,
IV) Slew rate,
V) CMRR,
VI) Gain bandwidth product,
VII) Power dissipation.
List the logic family. Give comparisons of each of them. Also give the
advantages and disadvantages of each logic families.
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Give the classification of Logic families. Also list the characteristics of
digital IC and explain any three of them
Explain with neat circuit diagram Tristate TTL devices.
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Describe the comparison of IC logic families.
Define slew rate and describe the technique to measure slew rate.
Define the following terms: :
Noise margin, fan-in ,Propagation delay , Figure of merit for logic families
With neat circuit explain the two inputs TTL NAND gate using TOTAM
POLE output also mention the advantages and disadvantages of TOTAM
POLE output.
Chapter 5: Operational Amplifiers
Explain transfer characteristics of differential amplifiers
Determine output voltage of differential amplifier for input voltage of 300
μV& 240 μV. Differential gain is 5000 & CMRR is 100.
What is meant by differential amplifier ? And also explain the working of
current source, with a circuit diagram.
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GTU EXAMINATION QUESTIONS
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What is CMRR ? What is the significance of CMRR? List and Explain the
methods to improve the CMMR.
Draw the equivalent circuit : Equivalent circuit of Ideal Op-amp
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Describe the operation of Emitter coupled differential amplifier.
Define the following terms:
(1) Input bias current (2) Input offset voltage (3) PSRR
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Explain briefly the following terms:
(1)Common mode rejection ratio
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Chapter 4: Stability and Oscillators:
Explain working principal of colpitt's oscillator. Also derive the expression
for frequency of oscillations.
For Hartley oscillators L1 = 1mH, L2 = 100 μH, m = 50 μH, C =100 pF.
Find
its frequency.
Draw the circuit and explain the operation of transistorized Wien bridge
oscillator.
Write short note on: Classification of amplifiers.
State Barkhausen in criteria for oscillation and Also explain stability criteria
for sinusoidal oscillator.
Draw and explain Hartley oscillator. Calculate the value of tank circuit
capacitor of a hartley oscillator for 50 kHz with L1 and L2 are of 100 µH.
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Design RC phase shift oscillator for the frequency of 2kHz.
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What is oscillator? Explain the concept of oscillation. Explain the concept of June-10
oscillation Properly with Barkhausen criteria.
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Classify the amplifiers types based on position of operating point and also
explain the distortion in amplifiers
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Derive the equation to get frequency of Wien bridge oscillator.
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Describe the principle of crystal oscillator along with AC equivalent circuit
and get the diagram of variation in xj with ω.
Design the following circuits :
(1) Design R-C Phase shift oscillator to produce sinusoidal output of 1Khz.
(2) Design colpitt’s oscillator to get frequency of 100Khz with an active
device BJT having hfe=45 and assume β=50 and Vcc=10volt.
“Barkhausen criteria” for oscillator circuit.
Chapter 3: Feedback Amplifiers
Determine the voltage gain, input, and output impedance with feedback for
voltage series feedback having A = -100, Ri = 10 kΩ, Ro = 20 kΩ for
feedback of (a) β = -0.1 (b) β = -0.5.
What are the four possible topologies of feed back amplifier? Draw each
with necessary details showing Vi, Vo, Ri, Ro, Ii, and Io. Derive input and
output resistance for each topology.
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GTU EXAMINATION QUESTIONS
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The 4% negative feedback is employed in an amplifier with Av=140,
fL=200Hz and fH=200 kHz, Ri=2kΩ, Ro=4.7kΩ Determine the following.
Avf, Rif, Rof, fLF, fHF
Calculate the bandwidth of an amplifier when 6% negative feedback
introduced to 300kHz bandwidth and 100 voltage gain? Also calculate gain
bandwidth product after and before application of feedback? Finally
calculate amount of feedback if bandwidth is calculate to 1 MHz.
What is the negative feedback system? List the general characteristics of the
negative feed back amplifier and explain any two of them with necessary
equation.
Describe the effect of negative feedback on amplifier bandwidth.
Obtained the expressions :
(1) Obtained the expression for transfer gain for negative feedback.
(2) Obtain the expression of input resistance and output resistance of an
amplifier for voltage shunt feedback.
Chapter 2: Multistage Amplifiers
Explain the working of RC coupled amplifier with neat diagram. Also
obtain its frequency response.
List the methods to analyze the multi stage amplifier with voltage series
feedback. Explain it with necessary equations.
Draw and explain the two cascaded CE transistor stage. Explain the
significance of each component connected into it, also derived required
equation
Draw and explain RC coupled amplifier. List all parameters affecting the
low frequency response of RC coupled amplifier and derived the equation
for any two of them
The upper 3dB frequency of 16 kHz and lower 3dB frequency of 25 Hz of a
three identical stage cascaded amplifier Calculate
(1) fL and fH of each stage.
(2) Band width of each stage.
Describe the effect of bypass capacitor and coupling capacitor in multi stage
common emitter amplifier.
Chapter 1: Transistor at High Frequencies
Write short note on: Validity of Hybrid – PI model.
Write short note on Hybrid π model for a transistor on CE configuration and
its circuit component.
Draw and Explain with necessary figure the single stage CE transistor
amplifier response. Also explain the significance of gain bandwidth product.
List the parameter those affecting to the transistor at high frequencies. Draw
the hybrid π model for CE configuration and explain it. Also derived the
equation for any two above listed parameter for CE configuration.
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Draw the equivalent circuit : Hybrid П common emitter model
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GTU EXAMINATION QUESTIONS