(b)Explain operation of the circuit shown in Fig. for Q. 1(b) for the given inputvoltage, Vinet)and plot the output voltage, Vout(t).Assume aforward drop of0.7 V for 2.(a)Calculate current through the n-channel MOSFET, Qninthe CMOS circuit showninFig. for Q.2(a). Given V
(b)Design an electronic circuit using ideal diodes and other necessary components toobtain the transfer characteristics as shown inFig. forQ.2(b).(18)-------------~------t25-~Dtd-~. ..~V•_. .. ..--.-4~.-V-. ~~_.--.-_---------_4VSV-rot-' .,/\lit)f1'~.+().2,~3.(a)Three bulbs BI, B2,and B3are connected in adiode circuit as shown in Fig. for Q.3(a). Calculate the power consumed byB3and the voltage drop acrossB].Assume aforward drop of0.75 Vforthe diodes. ----------,-, .. - .. - .C =$Jk~, .... ;-.:--"'-'--- ------- (20) (b)Draw a source follower amplifier circuit using p-channel MOSFET with properbiasing voltage and small input signal. Derive expressions for output resistance andvoltage gain using small signal analysis.(15)4.(a)Explain the operation of the diode circuit shown in Fig. forQ.4(a) and draw theoutput voltage,Voasafunction ofthe given input,Vi.Assume ideal diodes.(18) Contd P/3
There are FOUR questions inthis section. Answer any THREE. 5.(a)Draw the circuit diagrams, voltage wave-shapes and transfer characteristics of full-wave center-tapped and bridge rectifiers. Assume constant voltage drop model for thediodes. Also compare their relative advantages and drawbacks.(15)(b)A full-wave bridge rectifier circuit with a l-kQ load operates from a 220-V (nns)50 Hz supply through a 10-to-1 step-down transformer. It uses four diodes, each ofwhich can be modeled to have a0.7-V drop for any current.(20)(i)What isthe peak value ofthe rectified voltage across the load?(ii)For what fraction of acycle does each diode conduct?(iii) What isthe peak-inverse voltage?(iv) What isthe average voltage across the load?(v)What is the average current through the load? Contd P/4
=4=EEE201(a)For the circuit shown in Fig. for Q. 6(a), the peak values of Vsis Vp.Draw thewave-shapes of vs,vo,it and io.Also determine the expressions of(i)peak-to-peak ripple voltage,Yr.(ii)diode conduction interval, ~t.Make necessary assumptions.
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- Winter '14
- Bangladesh University of Engineering