STUPIDSID
1 (a)
Derive the expression for the CE short-circuit current gain Ai as a function of
Frequency.
7 M
1 (b)
The bandwidth of an amplifier extends from 20 Hz to 20 kHz. Find the
frequency range over which the voltage gain is down less than 1 dB from its
mid-band value.
7 M
2 (a)
Define negative feedback and positive feedback. Derive relationship between
Af and A.
7 M
2 (b)
List the procedures to follow to obtain the basic amplifier configuration without
feedback but taking the loading of the β network into account.
7 M
2 (c)
Draw the circuit of a voltage-shunt feedback amplifier.
7 M
3 (a)
State and explain the Nyquist criterion for stability.
7 M
3 (b)
An RC coupled amplifier with a midband voltage gain of 1000 is converted into
a feedback amplifier by feeding 10 percent of its output voltage in series with
the input opposing. What is the ratio of the half power frequencies with
feedback to those without feedback? If f L and f H for the amplifier without
feedback are 20 Hz and 50 kHz respectively, what are the corresponding values
after feedback has been added?
7 M
3 (c)
Sketch the circuit of a crystal controlled oscillator.
7 M
3 (d)
A crystal has the following parameters : L= 0.33 H, C=0.065 pf ,C'= 1.0 pF and
R=5.5 K. Find the series resonant frequency. By what percent does the parallel
resonant frequency exceed the series resonant frequency? Find the Q of the
Crystal.
7 M
4 (a)
Draw an IC OP Amp in block diagram form. Identify each stage by function.
7 M
4 (b)
Draw the equivalent circuit from which to calculate Ac for the emitter
coupled differential amplifier. Repeat the procedure for Ad.
7 M
4 (c)
Sketch the transfer characteristics of a differential amplifier. Explain why AGC
is possible with the differential amplifier.
7 M
4 (d)
Give DC analysis of output stage of MC 1530. Assume suitable component
values and supply voltages.
7 M
5 (a)
Draw the circuit of TTL gate and explain its operation.
7 M
5 (b)
Explain working of counter type ADC with suitable numerical example.
7 M
5 (c)
Explain weighted resistor DAC .
7 M
5 (d)
Explain working of successive approximation ADC with suitable numerical example.
7 M
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