Subcode

EC2254

Subject Name

Linear Integrated Circuits

Sem IVDegree B.E.Branch Electronics and CommunicationStaff Name

Dr.Reeba Ms. Jansi and K.Suja

Date of UpdationPart Un

itGroup

Q. No

Question

A 1 1 1 What are the limitations of basic differentiator?A 1 1 2 What is the limitation of basic integrator?A 1 1 3 What are the features of an instrumentation amplifier?A 1 1 4 Why are active filters preferred?A 1 1 5 What is the roll-off rate of a first order filter?

…….A 1 2 1 On what does the damping co-efficient of a filter

depend?A 1 2 2 Draw the transfer characteristics of an ideal comparator

and a practical comparator.A 1 2 3 Draw the circuit diagram of an op-amp differentiator

circuit.A 1 2 4 How does precision rectifier differ from the

conventional rectifier?A 1 2 5 Give an application of inverting amplifier.

………B 1 1 1 (i)Design a circuit to implement V0=0.545V3+0.273V4-

1.25V1-2V2 (8)(ii)Draw and explain a simple Op-amp differentiator. Mention its limitations. Explain with a neat diagram how it can be overcome in a practical differentiator. Design an op-amp differentiator that will differentiate an input signal with maximum frequency fmax=100Hz.(8)

B 1 1 2 i) What do you understand by an Integrator? (2)(ii) Draw and explain an ideal active op-amp Integrator circuit.(4)(iii) Draw the I/O waveforms for integrator (3 × ½ = 1 ½ )(iv) Derive the expression for change in output voltage. (3)

(v) List the applications of practical Integrator. (1 ½ )(vi) Design a practical integrator circuit with a dc gain of 10, to integrate a square wave of 10 KHZ (4)

B 1 1 3 With the help of circuits and necessary equations, explain how log and antilog computations are performed using IC 741.

B 1 1 4 (i) Short note on: Differential amplifier and Schmitt trigger.

(ii)Draw an adder-subtractor type of circuit with op-amp to obtain the relation V0=(V1+V2)-(V3+V4) (4)(iii)Calculate the output of the following circuit. (4)

……….B 1 2 1 With a neat circuit diagram, Explain second order

Low pass filter and derive the expression for its standard transfer function and obtain the frequency response.

B 1 2 2 (i) What do you understand by an instrumentation amplifier. (2)(ii) State the requirements of a good Instrumentation Amplifier. (4)(iii) Draw the circuit diagram and explain the working of instrumentation amplifier. (6)(iv) Mention the specific advantages of three op-amp Instrumentation Amplifier circuit.(4)

B 1 2 3 (i)Design a first order High-pass filter for cut-off frequency of 2kHZ and pass-band gain of 2.(8)(ii)Explain a positive clipper circuit using an op-amp and a diode with neat diagrams.(8)

B 1 2 4 (i)Design an op-amp based second order active low pass filter with cut-off frequency 2khz.(8)(ii)Draw and explain the circuit of a voltage to current convertor if the load is(1)Floating (4)(2)Grounded (4) ………

A 2 1 1 Define Capture range, Lock in range, Pull in time.

A 2 1 2 List the applications of the PLL.A 2 1 3 What is the basic principle of VCO?A 2 1 4 List the advantages of a variable transconductance

technique.A 2 1 5 A PLL frequency translator has a center frequency f

and input frequency f1, what will be the output frequency?……….

A 2 2 1 Explain the use of LPF in PLL.A 2 2 2 What are the applications of PLL as voltage output and

as frequency output?A 2 2 3 How voltage output of a PLL can be used as frequency

discriminator?A 2 2 4 What is a two quadrant multiplier?A 2 2 5 A PLL frequency multiplier has an input frequency of

“f” and a decade counter is included in the loop. What will be the frequency of the PLL output?

…………….

B 2 1 1 Draw the functional block schematic of a NE565 PLL and explain the roles of the low pass filter and VCO. Derive the expression for the capture range and lock in range of the PLL.(16)

B 2 1 2 Explain, with necessary equations, the basic circuits of ‘Linearized transconductance multiplier’ and ‘Differential V-I convertor’. Hence explain the ‘Four quadrant variable transconductance multiplier’ circuit.

B 2 1 3 (i)Draw the circuit and explain the working of one quadrant variable transconductance analog multiplier. (8) (ii)Draw the circuit of a PLL used as AM detector and explain its operation.(8)…….

B 2 2 1 With suitable block diagram, explain the operation of 565 voltage controlled oscillator. Also derive an expression for the frequency of the output waveform generated.

B 2 2 2 Explain with diagram how PLL can be used as (i)FM detector(8)(ii)Frequency synthesizer (Explain principle, characteristics and working(8)

B 2 2 3 (i)List and define the various performance parameters of a multiplier IC. (3)

(ii)How multiplier is used as voltage divider(5) (iii) Draw the circuit and explain the working of one quadrant variable transconductance analog multiplier. (8)

B 2 2 4 What are important building block of phase locked loop (PLL) and explain its working?(4)Sketch and explain the following applications of multipliers. (a)Squaring (4)(b)finding square root(4)(c)frequency doubler(4)…………