Code No. 311402 III/IV B.Tech. I-Semester Examination November, 2002. DIGITAL ELECTRONICS (Mechatronics) Time: 3 hours Max. Marks: 80

b)

1

Answer any FIVE questions All questions carry equal marks --In RC low pass circuit find the upper 3dB frequency. What is rise time? Derive the expression for rise time kr? Explain the operation of a Bistable Multivibratic circuit with neat diagram.

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1.a)

Set No

Draw the miller sweep circuit and simulate the circuit with Integrator. What is the function of a schmittrigger circuit. Obtain its upper threshold voltage and lower threshold voltage.

3.a)

Given the Boolen function f(x,y,z) = xy+x’y’+y’z i) Implement it with only OR and NOT gates. ii) Implement it with only AND and NOT gates. Determine the expression for the output ‘Y’ and the truth table for the circuit in fig.1

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2.a) b)

Implement a full-adder circuit with a decoder and two OR gates. Design a 3-bit synchronous counter using J-K flip flops.

5.a) b)

Draw the circuit of a crystal controlled clock generator and explain its operation. Design a Gray-to-binary code converter.

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4.a) b)

Contd…2

Code No. 311402

Draw the transfer characteristics and output of a two level clipper and what are the diode states: Assume the diodes are ideal.

State and prove clamping-circuit theorem.

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b)

Set No.1

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6.a)

-2-

Draw a schematic circuit of 7-segment LCD character and explain. What is a bar-graph display? An anolog 0-IV meter display has to be realized in bar graph format with a resolution of 10mv using LEDs. Discuss a method of realizing this. Draw a schematic diagram.

8.

Write short notes on any three of the following: a) Dot Matrix display. b) Linear Current Sweep circuits c) Decoders d) Decade Counters.

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7.a) b)

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---

Code No. 311402

Set No

III/IV B.Tech. I-Semester Examination November, 2002. DIGITAL ELECTRONICS (Mechatronics) Time: 3 hours Max. Marks: 80 Answer any FIVE questions All questions carry equal marks --1.a) What are the applications of Monostable multivibrator and give the some of comparision between Astable and Bistable multivibrator. b) Assume that the diodes are ideal. Make a plot of ‘o’ against Vi for the range of Vi from 0 to 50v (sine wave input). Indicate which diodes are conducting.

b) 3.a)

b)

Draw the exponential sweep circuit and explain its operation draw the resultant exponential wave form. What are the general features of a time-base signal. Simplify the following Boolean function in i) Sum of products and ii) Product of sums(POS). F(w,x,y,z) = m(0,1,2,3,5,6,9) Define Prime implicant and essential prime implicant, explain with one example.

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2

Draw the circuit of a master slave J-K flip-flop and explain its operation. Design a decade up counter using JK flip flops.

5.a) b)

What are the applications of LED, LCD display stems. Design a half subtractor circuit using NOR gates.

6.a)

Show that the Low-pass RC circuit acts as a Integrator and compare its time constant =RC with time ‘t’. How the transistor acts as a switch? Explain about it.

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4.a) b)

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b)

7.a) b)

What is D flip-flop. Give its truth table as well as its excitation table. Impliment F(A,B,C)=m(0,2,3,6,7) with a multiplexer.

8.

Write a short notes on the following: a) Clamping circuit b) Driver circuit ---

c) Encoders.

Code No. 311402

Set No

III/IV B.Tech. I-Semester Examination November, 2002. DIGITAL ELECTRONICS (Mechatronics) Time: 3 hours

Answer any FIVE questions All questions carry equal marks --What are the applications of clipping circuits and compare the difference between clippling and clamping and give its examples with circuit diagram. Draw a circuit of self-biased transistor bistable multivibrator and explain its operations.

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b)

Max. Marks: 80

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1.a)

3

What are the methods of generating a Time-base wave form. What is the difference between transmission error and displacement error. Show their graphical wave forms.

3.a)

Obtain the truth table of the following functions i) f1(ABCD) = A’B’CD’ + AB’ + A’B’C’D’ + BC’ _ _ _ ii) f2(wxyz) = w’x’ + yz’ + wzy’z  wx + yz + wxyz Convert the following to the other canonical form i) F(x,y,z) = (1,3,5,7) ii) F(A,B,C,D) = (1,2,4,7,9). Using truth table obtain borrow and difference of a full-subtractor and design the circuit using AND, OR gates. Design a J-K flip-flop and what is race-around condition.

b)

4.a) b)

What is mean by excitation table? Give the excitation table for S-R Flip-Flop. Simplify the following Boolean expressions i) [(CD)’+A]’ + A + CD + AB. ii) (A+C+D) (A+C+D’) (A+C’+D) (A+B’).

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5.a) b)

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2.a) b)

Draw the circuit of a 2-digit 3x5 dot matrix LED display and explain. Draw the circuit diagram of schmittrigger circuit and explain its operation.

7.a)

Distinguish between d.c driving and a.c driving of LCD 7-segment characters. Give reasons for the choice of a.c driving in high reliability LCD systems. Design a half Adder circuit using NAND gates and write its truth table.

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6.a) b)

b)

8.

Explain about the following: a) Dot Matrix display b) Shift registers c) Universal gates. ---

Code No. 311402 III/IV B.Tech. I-Semester Examination November, 2002. Set No DIGITAL ELECTRONICS (Mechatronics) Time: 3 hours Max. Marks: 80 Answer any FIVE questions All questions carry equal marks --1.a) Show that high pass RC circuit acts as differentiator and derive the generalized expression for high pass RC circuit. b) In RC high pass circuit for pulse input what is the output expression and show graphically input and output wave forms.

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4

How the transistor acts as a switch. Explain clearly with circuit diagram. Draw the circuit diagram of a transistor bootstrap time-base Generator and explain its operation.

3.a) b)

Convert the decimal number 186.4 to base 4, base 5, base 6 and base 8. Obtain the 9’s and 10’s complement of the following decimal numbers: 14672; 32895; 45531 and 64820.

4.a)

Design a BCD to excess 3 code converter using minimum number of NAND gates. Draw the circuit diagram of a S-R Flip-Flop and explain its operation with a truth table.

5.a) b)

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2.a) b)

Draw a circuit of the emitter coupled Monostable multivibrator and explain its operation with output wave forms. Show that the percentage tilt is given by

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P= 1-e-1/2fRC x200% 1+e-1/2fRC For a symmetrical square wave of peak-to peak amplitude ‘V’ and frequency f’ is applied to a high pass RC circuit. Convert J-K Flip-Flop into ‘D’ Flip-Flop. What are the applications of shift registors and explain.

7.a) b)

What are the features which are important in LCDs. Draw the circuit of a 5-digit 7-segment LED display using horizontal strobing and explain.

8.

Write short notes on the following: a) DOT Matrix LED display. b) Miller Sweep circuit c) Decoders. ---

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6.a) b)

Set No

Answer any FIVE questions ... 3.a) Given the Boolen function f(x,y,z) = xy+x'y'+y'z ... 5.a) Draw the circuit of a crystal controlled clock generator and explain its ...
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