Jawaharlal Nehru Technological University Kakinada 2008 B.Tech Electrical and Electronics Engineering PULSE AND DIGITAL CIRCUITS - Question Paper

PULSE AND DIGITAL CIRCUITS
( Common to Electrical & Electronic Engineering and Electronics &
Instrumentation Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1. (a) A symmetrical square wave whose peak-to-peak amptitude id 2V and whose
avg. value is zero as applied to on Rc integrating circuit. The time constant
is equals to half -period of th esquare wave ?nd the peak to peak value of the
output amplitude
(b) define the relationship ranging from rise time and RCtime constant of a low pass
RC circuit. [8+8]
2. (a) Determine Vo for the network shown in fugure 2a for the provided waveform
.Assume ideal diodes.
Figure 2a
(b) discuss negative peak clipper with and without reference voltage. [8+8]
3. (a) For a common emitter circuit Vcc = 10V, RC = 1kO IB=0.2A. Determine
i. The valve of hFE(min) for saturation to occor
ii. If Rc is changed to 220O, will the transistor be saturated
(b) discuss the phenomenon of latching in a transistor. [8+8]
4. Draw the circuit diagram for Schmitt trigger and discuss its operation. elaborate
the applications of the above circuit? Derive the expressions for UTP and LTP.
[16]
5. discuss the basic principal of Miller and Bootstrap time base generators and also
derive the equations for sweep speed fault. [16]
6. (a) With the help of a circuit diagram and waveforms discuss frequency division
of an a stable multivibrator with pulse signals.
1 of 2Code No: 07A30401 Set No. 2
(b) discuss with the help of block diagram and waveforms for acheiving division
of relaxation devices without phase jitter. [8+8]
7. (a) Distinguish ranging from sampling gates and logic gates?
(b) discuss the operation of a chopper ampli?er with neat block diagram and
waveforms.
(c) Distinguish ranging from unidirectional and bidirectional gates. [4+8+4]
8. (a) Draw the circuit diagram of diode-transistor logic NOR gate and discuss its
operation.
(b) Draw the output waveform X for the provided inputs ?gure 8b
Figure 8b
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2 of 2Code No: 07A30401 Set No. 3
II B.Tech I Semester Regular Examinations, November 2008
PULSE AND DIGITAL CIRCUITS

Earning:   Approval pending.