Digital Circuits
1
GATE ECE 1994
Subjective
+10
-0
A Boolean function, F , given as sum of product (SOP) terms as F= $$\sum {} $$m(3,4,5,6) with A,B, and C as inputs. The function, F, can be expreeed on the Karnaugh's map shown below.
(1) What will be the minimized SOP expression for F?
(2) Implement this function on an 8 : 1 MUX.
2
GATE ECE 1993
Subjective
+10
-0
Signals A,B,C,D and $$\overline D $$ are available. Using a single 8 - to - 1 multiplexer and no other gate, implement the Boolean function.
$$f(A,B,C,D) = B.C + A.B.\bar D + \bar A.\bar C.\bar D$$
$$f(A,B,C,D) = B.C + A.B.\bar D + \bar A.\bar C.\bar D$$
3
GATE ECE 1989
Subjective
+10
-0
A chemical reactor has three sensors indicating the following conditions:-
(1) Pressure (P) is low or high'
(2) Temperature (T) is low or high' and
(3) Liquid level (L) is low or high.
(1) Pressure (P) is low or high'
(2) Temperature (T) is low or high' and
(3) Liquid level (L) is low or high.
its has two controls - Heater (H) which is either on or off and inlet value (V) which is open or close. The controls are operated as per Table.
(a) Using the convertion High =1, Low = 0, On=1, Off=0, Open=1 and Closed=0, draw the Karnaugh maps for H and V.
(b) Obtain the minimal product of sums expressions for H and V.
(c) Realize the logic for H and V using two 4-input multiplexers with T and L as control inputs. Used T as MSB.
Questions Asked from Marks 10
GATE ECE Subjects
Signals and Systems
Network Theory
Control Systems
Digital Circuits
General Aptitude
Electronic Devices and VLSI
Analog Circuits
Engineering Mathematics
Microprocessors
Communications
Electromagnetics