1

GATE ECE 1997

Subjective

+5

-0

A sequence generator is shown in figure. The counter status (Q

The Clock has a period of 50ns and transitions take place at the rising clock edge.

(a) Give the sequence generated at Q

(b) What is the repetition rate for the generated sequence?

_{0}Q_{1}Q_{3}) is intialized to 010 using preset/clear inputs.The Clock has a period of 50ns and transitions take place at the rising clock edge.

(a) Give the sequence generated at Q

_{0}till it repeats.(b) What is the repetition rate for the generated sequence?

2

GATE ECE 1996

Subjective

+5

-0

A 4-bit shift register, which shifts 1 bit to the right at every clock pulse, is intialized to values (1000) for (Q

_{0}Q_{1}Q_{2}Q_{3}). The D input is derived from Q_{0}, Q_{2}and Q_{3}through two XOR gates as shown in figure.(a) Write the 4-bit values (Q_{0}Q_{1}Q_{2}Q_{3}) after each clock pulse till the pattern (1000) reappears on (Q_{0}Q_{1}Q_{2}Q_{3}).

(b) To what values should the shift register be intialized so that the pattern (1001) occurs after the first clock pulse?

3

GATE ECE 1996

Subjective

+5

-0

A state machine is required to cycle through the following sequence of states:

One possible implementation of the state machine is shown figure. Specify what signals should be applied to each of the multiplexer inputs

Questions Asked from Sequential Circuits (Marks 5)

Number in Brackets after Paper Indicates No. of Questions

GATE ECE Subjects

Signals and Systems

Representation of Continuous Time Signal Fourier Series Discrete Time Signal Fourier Series Fourier Transform Discrete Time Signal Z Transform Continuous Time Linear Invariant System Transmission of Signal Through Continuous Time LTI Systems Discrete Time Linear Time Invariant Systems Sampling Continuous Time Signal Laplace Transform Discrete Fourier Transform and Fast Fourier Transform Transmission of Signal Through Discrete Time Lti Systems Miscellaneous Fourier Transform

Network Theory

Control Systems

Digital Circuits

General Aptitude

Electronic Devices and VLSI

Analog Circuits

Engineering Mathematics

Microprocessors

Communications

Electromagnetics