STUPIDSID
1(a)
What is CMRR in an operational amplifier? A 741 op-amp is used in non inverting amplifier with a voltage gain of 50. Calculate the typical output voltage that would result from a common mode input with a peak level of 100 mV.
6 M
1(b)
Design a non-inverting direct coupled amplifier using a bipolar op-amp. Write the circuit diagram.
7 M
1(c)
Design an inverting amplifier using a 741 op-amp. The voltage gain is to be 50 and the output voltage amplitude is to be 2.5 V.
7 M
2(a)
Explain about the high input impedance coupled voltage follower circuit, with relevant equations.
7 M
2(b)
The inverting designed (say Av = 50 and V0 = 2.5 V) is to be capacitor coupled and to have a signal frequency range of 10 Hz to 1 kHz. If the load resistance is 250 Ω. Calculate the required capacitor values.
6 M
2(c)
Explain about capacitor coupled voltage follower using a single polarity supply, with circuit diagram.
7 M
3(a)(i)
Calculate the slew rate limited cut off frequency for a voltage follower circuit using a 741 op-amp if the peak sinewave output is to be 5V.
3 M
3(a)(ii)
Determine the maximum peak value of the sinusoidal output voltage that will allow the 741 voltage follower circuit to operate at the 800 kHz unity-gain cut off frequency.
3 M
3(a)(iii)
Calculate the maximum peak value of sine wave output voltage that can be produced by the amplifier in part (i) equation and the op-amp is a 741 and f2 is 8 kHz.
3 M
3(b)
Explain briefly about input ampedance modification (Zin Mod) technique of frequency compensation with circuit diagram.
6 M
3(c)
Explain the 'circuit stability precautions' for the operational amplifier using the manufacturer's recommended compensating components.
5 M
4(a)
Explain the 'current amplifier' circuit using operational amplifier.
6 M
4(b)
Explain the instrumentation amplifier with differential input/output which accepts a differential input voltage and amplifiers it to produce a differential output using op-amps.
8 M
4(c)
Design a non saturating precision half wave rectifier, which produce a 2 V peak output from a sinewave input with a peak value of 0.5 V and frequency of 1 Mhz. Use a bipolar op-amp with a supply voltage of ±15V.
6 M
5(a)
Explain the multiplier circuit with schematic symbol.
6 M
5(b)
Explain the operation of the phase-shift oscillator circuit with relevant waveforms.
8 M
5(c)
Using a BIFET op-amp with a supply of ±12 V, design a wein bridge oscillator to have an O/P frequency of 15 kHz.
6 M
6(a)
Explain the operation of the Astable multivibrator circuit using operational amplifier with relevant waveforms.
8 M
6(b)
Explain the operation of the first order active low pass filter circuit with frequency response characteristics using operational amplifier.
6 M
6(c)
Design a first order high pass active filter circuit to have a cut off frequency of 5 kHz. Use an LM108 op amp and estimate the highest frequency can be passed.
6 M
7(a)
Explain the following terms such as (i) Line regulation (ii) Load regulation (iii) Ripple rejection briefly.
6 M
7(b)
Explain the operation of the 723 integrated circuit voltage regulator contains a reference voltage sources (D1) an error amplifier (A1) a series pass transistor (Q1) and a current limiting transistor (Q3).
7 M
7(c)
Calculate the resistance of R1 and R2 for the LM217 voltage regulator to produce an output voltage of 9 V. (Assume C1 = 0.1 μ and C2 = 1 μF)
7 M
8(a)
Explain the 555 Timer circuit used a astable multivibrator, with relevant waveforms.
8 M
8(b)
Explain the operating principles of phase locked loop with relevant diagram.
7 M
8(c)
Write a short notes on voltage controlled oscillator.
5 M
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