Punjab Engineering College 2005 B.Tech Linear Integrated Circuits - Question Paper

EC 305 fifth Sem

LINEAR INTEGRATED CIRCUITS

Max Marks 60
Max Time three hours
Note: part A is compulsory. Attempt any 4 ques. from part B and 2 from part C.

part A Marks two every

1.
(a) discuss the difference ranging from constant current bias and current mirror.
(b) What is the difference ranging from a basic comparator and Schmitt trigger?
(c) discuss the difference ranging from digital and linear ICs.
(d) Show how a non-inverting amplifier can be made to operate as voltage follower.
(e) describe input offset voltage and CMRR for an OP-AMP.
(f) elaborate advantages of adjustable voltage regulator over fixed voltage regulator?
(g) describe break frequency and bandwidth.
(h) discuss the difference ranging from integrator and differentiator and provide 1 application of every.
(i) What is VCO? provide tow applications that require VCO.
(j) What is voltage limiting and why is it needed?

part B Marks five every

2. An emitter based dual input, balanced output differential amplifier has the subsequent specifications: Vcc = -VEE = 10 V. R¬c1=Rc¬2 = 2.7 kilo ohm and RE= 3.9 kilo ohm, ?ac=?dc=100, VBE = 0.715 V. Calculate:
(a) Operating current and voltage for every transistor.
(b) Voltage gain

3. describe all parameters that are used to specify an OP-AMP. List their significance.

4. Draw block diagram of IC555 and discuss its working.

5. provide a theoretical method to find the frequency curve of an operational amplifier if the poles and zeros are not provided.

6. In a triangular wave generator R2=1.2 kilo ohm,R3=6.8 kilo ohm, R1 = 120 kilo ohm, c1=0.01 micro f.
Determine:
(a) Peak to peak output amplitude of triangular wave.
(b)Frequency of triangular wave.

part C Marks 10 every

7. What is PLL? discuss its operating principle with the help of a block diagram. define the function of every block in detail in block diagram. explain at lowest tow applications of PLL. 1,2,3,4

8. (a) elaborate switching regulators? define theory of switching regulators.
(b) An on-inverting zero crossing detector uses OP-AMP micro A with an open loop gain of 92 dB. If the power supply voltage are + 15 V and input offset 0 V:

(i) obtain the input voltage range that causes the output voltage to slew ranging from the power supply rates.
(ii) if a one mV sin wave is on the input, draw the output waveform in time synchronization with input waveform.

9 (a) An inverting voltage comparator uses an OP-AMP with saturation voltages of + 12 V, R1=2 k ohm, RF=390 k ohm. The reference voltage is -3V. Determine 2 voltages at which the comparator will switch.
(b) define differential mode Instrumentation Amplifier. obtain its output.

Earning:   Approval pending.