Analog Electronics

MALLA REDDY ENGINEERING COLLEGE & MANAGEMENT SCIENCES (Approved by the AICTE, New Delhi and affiliated to JNTU, Hyderabad) Kistapur Hamlet of Medchal, Hyderabad, Medchal Dist. - 501 401 ASSIGNMENT-I BRANCH : EEE YEAR & SEM :II- I Sem SUB : ANALOG ELECTRONICS

TIME: MAX. MARKS :75 Marks

PART-A

25 marks

Answer all the questions 1. a.

Define drift current?

[2]

b.

Explain about forward bias of diode?

[3]

c.

Define Transistor?

[2]

d.

What are the merits of full wave rectifier?

[3]

e.

Define early effect or base width modulation?

[3]

f.

Why biasing is necessary in BJT amplifiers?

[2]

g.

Define benefits of H-Parameter.[Nov-Dec 2017]

[3]

h.

What do you mean by clipper?

[2]

i.

What is the bypass capacitor & why it is connected in CE Amplifier?

[3]

j.

[May 2016] How many types of clampers are there?

[2]

PART-B

2.

50 marks

a) Explain the concept of dc load line with the help of neat diagram?

[5+5]

b) With neat circuit diagram explain the input and output characteristics of BJT in CC configuration. OR 3.

Draw the circuit of an emitter follower, and derive the expressions for AI, AV, [10] RI, RO in terms of CE parameters. [May-2017]

4.

a) Explain the operation of clamper circuits with neat output waveforms. b) Draw the circuit of a half-wave-rectifier and find out the ripple factor, % [5+5] regulation? Efficiency and PIV? OR

5.

6.

Explain the operation of p-n junction diode under forward and Reverse bias conditions and Sketch the V-I characteristics.

a) A Ge transistor having β=100 and Vbe=0.2v is used in a fixed bias amplifier circuit where vcc=16v,Rc=5 KΩ and RB= 790 KΩ determine its operating point.

[10]

[5+5]

b) List out the merits and demerits of Bridge type Full Wave rectifiers over centre tapped type Full Wave rectifiers? OR 7.

a) Draw the input and output characteristic of a transistor in common collector configurations? b) Describe the significance of the terms, ‘α’ and ‘β’. Establish a relation [5+5] between them?

8.

Draw the self-bias circuit and obtain the expression for the stability

[10]

Factor. Discuss the advantages and disadvantages of self-biasing? OR 9.

Classify amplifiers based on operating point selection. Compare them in terms of efficiency and distortion. [Dec-2017]

[10]

10. a) Draw the circuit diagram & small signal equivalent of CB amplifier using [5+5] accurate h-parameter model. Derive expressions for AV, AI, Ri and R0? b) Determine the values of IC and IE for a transistor with αdc = 0.99 and ICBO = 5μA, if IB is measured as 20 μA? OR 11. a) Design an Emitter bias circuit using silicon transistor to achieve a stability factor of 20, with the following specifications: VCC = 16V, VBE = 0.7V, VCEQ [5+5] = 8V, ICQ = 4 mA & β= 50. b) Distinguish between the comparator and clipping circuit?