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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 4
26.
For the ring oscillator shown in the figure, the propagation delay of each inverter is 100 pico sec. What is the fundamental frequency of the oscillator output __________
10 MHz
100 MHz
1 GHz
2 GHz
Answer: Option
Explanation:

T = 500 x 10-12 = 5 x 10-10

= .

27.
If A is 1011, A" is
1011
0100
1100
1010
Answer: Option
Explanation:

Taking 2's complement twice gives the original number.

28.
Which of the following is not a characteristic of a flip flop?
It is a bistable device
It has two outputs
It has two outputs are complement of each other
It has one input terminal
Answer: Option
Explanation:

Flip-flop has more than 1 input.

29.
The number of flip flops needed for a Mod 7 counter are
7
5
3
1
Answer: Option
Explanation:

23 = 8 If 3 flip-flops are used the modulus can be a maximum of 8.

30.
For AB + A C + BC = AB + A C the dual form is
(A + B) (A + C)(B + C) = (A + B)(A + C)
(A + B ) (A + C)(B + C) = (A + B)(A + C)
(A + B) (A + C) (B + C) = (A + B) (A + C)
none of the above
Answer: Option
Explanation:

Change OR to AND and vice versa.

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