1
GATE ECE 1987
Subjective
+8
-0
A 2-input up/down synchrconous counter using two toggle flip-flops is shown in Fig.1. The counter's sequence is to be controlled by the input M as follows:
For M=1, sequence of Q1, Q0 is ..00, 01, 10, 11, 00, 01.......
For M=0, sequence of Q1, Q0 is ..00, 11, 10, 01, 00, 11......
For M=1, sequence of Q1, Q0 is ..00, 01, 10, 11, 00, 01.......
For M=0, sequence of Q1, Q0 is ..00, 11, 10, 01, 00, 11......
(a)Design the necessary feedback logic for T1 and T0.
(b)Realize the feesback logic using inverters and 4-input multiplexers only. Use Q1 and Q0 as the control inputs of the multiplexer with Q1 as the MSB.
Questions Asked from Sequential Circuits (Marks 8)
Number in Brackets after Paper Indicates No. of Questions
GATE ECE Subjects
Network Theory
Control Systems
Electronic Devices and VLSI
Analog Circuits
Digital Circuits
Microprocessors
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
Communications
Electromagnetics
General Aptitude