1(a) How do multiple
lead or lag networks interact to form an overall system response? (4 Marks)
(b) Mention the
advantages of using an active load. (4 Marks)
(c)What is a mask and
how is it used in the construction of IC op amps? What are the advantages of
monolithic IC construction? (8 Marks)
(d) A noninverting
amplifier has a midband voltage gain of 18 dB and a single-lag network at 200
kHz. What are the gain and phase values at 30 kHz, 200 kHz and 1 MHz? (4 Marks)
2(a) Explain the term
sacrifice factor. (4 Marks)
(b) Explain the terms
virtual ground and floating load. (6 Marks)
(c) What form pof
feedback is used for the inverting current amplifier? (4 Marks)
(d) Design a simple
differential amplifier with an input impedance of 10 kΩ per leg and a voltage
gain of 26 dB. (6 Marks)
3 (a) Mention the
advantages and disadvantages of noncompensated op-amps. (6 Marks)
(b) What is the cause for DC offset voltage? (4
Marks)
(c) Write a note on the
effect of slew rate on pulse signals. (6 Marks)
(d) Determine the upper
break frequency for a noninverting amplifier with a gain of 20 dB while using
741 op amp. (4 Marks)
4 (a) Explain how a
Norton amplifier achieves input differencing. (6 Marks)
(b) Utilizing the
LM3900, design an inverting amplifier with a gain of 12 dB, an input impedance
of at least 100 kΩ, and a lower break frequency not greater than 25 Hz. (8
Marks)
(c) What is a Schmitt
trigger? (4 Marks)
(d) Mention the
advantages of active rectifiers against passive rectifiers. (4 Marks)
5 (a) What is the
function of a pass transistor? (6 Marks)
(b) Explain the term
thermal resistance. (4 Marks)
(c) Explain the
correlation between the output current demand and the pulse width modulator
used in switching regulators. (6 Marks)
(d) Design a +12 V
regulator using the LM 317. The output current capability should be atleast 900
mA. (4 Marks)
6 (a)What is the
function of the capacitor in the basic integrator and differentiator? (4 Marks)
(b) Using a neat
sketch, explain the operation of Wien bridge op amp oscillator. (8 Marks)
(c) Explain the
difference between astable and monostable operation of a timer. (4 Marks)
(d) Assuming an
accurate 50 kHz oscillator as a source, generate a stable 400 kHz square wave
using a PLL. (4 Marks)
7 (a) What are the four
main types of filters. (4 Marks)
(b) Explain the
operation of adjustable bass equalizer. (6 Marks)
(c) Explain different
filter alignment types. (6 Marks)
(d) A band-pass filter
has upper and lower break frequencies of 9.5 kHz and 8 kHz. Determine the
centre frequency and Q of the filter. (4 Marks)
8 (a) Explain the terms
quantization and Nyquist frequency. (6 Marks)
(b) Differentiate
between integral nonlinearity and differential nonlinearity. (6 Marks)
(c) What is the purpose
of a track-and-hold amplifier? (4 Marks)
(d) A certain system
uses a 12-bit word to represent the input signal. If the maximum peak-to-peak
signal is set for 2 V, determine the resolution of the system and its dynamic
range. (4 Marks)
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