Punjab Technical University 2009-5th Sem B.Tech Electronics and Communications Engineering PDSC-ESTER - Question Paper

PULSE AND DIGITAL SWITCHING CIRCIUITS (DEC 2009)

part A
Q1.
(A) What is the relation ranging from 3db frequency nad time constant in high pass RC circuit?
(B) What should be given to an attenuator to get attenuation independent of frequency?
(C) What is relation ranging from bandwidth and rise time of an amplifier?
(D) What is effect of bypass capacitor on bandwidth of amplifier?
(E) Define storage time of a diode?
(F) Write application of a schottky diode?
(G) Why under reverse biased condition a diode is presumed to be open circuited?
(H) Define limiter?
(I) Write advantage of using parallel clipper over series clipper?
(J) What is a free running multivibrator?

part B

Q2. Derive and draw the response of high pass RC circuit to square wave input voltage?
Q3. What is double differentiator circuit? Draw and discuss its response to ramp input?
Q4. discuss shunt compensation used with basic amplifier?
Q5. Write a note on distributed amplifier listening its important features?
Q6. discuss how the transistor can be used as a switch in a circuit and under what condition a transistor is stated to be OFF and ON respectively?

part C

Q7. (a) define how schottky diode helps reducing storage time?
(b) discuss behavior of MOS transistor as a switch?
Q8. (a) What is effect of diode characteristics on clamping voltage?
(b) discuss with circuit diagram function of a positive clipper with voltage divider circuit?
Q9. (a) explain unsymmetrical triggering of a bistable multivibrator?
(b) discuss with circut diagram function of collector coupled multivibrator?

Earning:   Approval pending.