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Friday, 6 December 2013

Op-amps and linear integrated circuits- model question paper for B.E/B.Tech



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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