[Total Time: 3 Hours]
[Total Marks: 80 M]
NB: 1) Question 1 is compulsory.
2) Attempt any three questions from the rest.
3) Make any suitable assumption wherever required.
Q.1) Answer any four.
a) Explain the construction and working of Schottky diode. [5M]
b) What do you understand by ‘Pinch off voltage’ and ‘cut off voltage’ as applied to FET. [5M]
c) Explain in brief the re model in BJT. [5M]
d) What is the effect of Negative feedback on bandwidth and overall gain? [5M]
e) Find frequency of oscillations for Colpitt’s oscillator with C1=0.01μF, C2=0.001μF & L=5mH. [5M]
Q.2) a) Derive the expression for ripple factor for Full Wave Bridge Rectifier with LC filter. [10M]
b) Compare different biasing methods of BJT and calculate the values of IBQ, ICQ & VCEQ for the following fig. 1 shown of silicon transistor with β=100. [10M],
Q.3) a) Draw & explain E-type MOSFET in detail with its input & output characteristic. [10M]
b) For the circuit shown in fig.2 determine voltage gain, input impedance and output impedance. FET has IDSS=10mA and Vp=-4.5V.
Q.4) a) Draw and explain Hartley oscillator and derive an expression for its frequency of oscillation. [10M]
b) What are the advantages of negative feedback? [5M]
c) Explain in brief various types of negative feedback amplifiers. [5M]
Q.5) a) Explain in features of multistage RC coupled amplifier. Draw and explain two stage RC coupled transistor amplifier. [10M]
b) Derive the expression for stability factor (S) for voltage divider biasing in transistor. [10M]
Q.6) a) Write short note on frequency response of BJT amplifier. [10M]
b) Write short on different types of filter circuits used to remove the ripple in rectifier output. Derive the ripple factors for each. [10M]