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(b)(i) Derive the general expression for A y , A i , Ri, and Ro from the bas.; - - : >.0cielcircuit.

( i i ) A CE amplifier is drawn by a voltage source of internal resistance - :.and the load impedance is a resistance of R L = 1 0 0 0 Q . The h-parameters have k;values; compute the various parameters using exact or approx im ate analysis.h i e = lkQ , h f e=50, hw^2*10' 4 , h o e = 25uA/V13 . (a) Explain the function o f emitter coupled differential amplifier. Derive A d , Av,and CMRR. (16)

O r(b)(i) Derive the expression for simplified hybrid model of common emitter

configuration to calculate A v , ' A i , Z j , Y 0 - (8)( i i ) Define CMRR. Explain how the CMRR can be improved. (8)

14 . (a)A half wave rectifier is supplied from 230, 50Hz supply w i t h a step down ratio of3:1 to resistive load of l O k f i . The diode forward resistance is 75C1 while transformersecondary resistance is 10O. Calculate the maximum, average, RMS value of dc currentand voltage. Also f ind rectifi cation efficiency and ripple factor. (16)

O r(b ) Derive the expression for ripple factor for the following filters: C, L, LC, Y[ i f

F W rectified signal is applied as input. . (4+4+4+4)15 . (a) Draw the block diagram o f switched mode power supply and explain theoperation. Mention the swi tching regulator types and some advantages. (12+4)

. Or( b ) (I) what is meant by a voltage regulation?

( i i ) What are the types of voltage regulator?( i i i ) Explain detailed operation of the zener diode shunt regulator.

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