Exercise: Digital Electronics

Questions for: Digital Electronics

What will be maximum input that can be converted for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).
A:
9 V
B:
9.45
C:
10 V
D:
8 V
Answer: B

.

A pulse train with a 1 MHz frequency is counted using a 1024 modulus ripple counter using JK flip flops. The maximum propagation delay for each flip-flop should be
A:
1 Ξs
B:
0.5 Ξs
C:
0.2 Ξs
D:
0.1 Ξs
Answer: D

Total delay = = 1 ms = 10 x delay of one flip flop. Therefore delay for one flip-flop = 0.1 ms.

A counter has 4 flip flops. It divides the input frequency by
A:
4
B:
2
C:
8
D:
16
Answer: D

24 = 16.

A 4 bit synchronous counter has flip flops having propagation delay of 50 ns each and AND gates having propagation delay of 20 ns each. The maximum frequency of clock pulses can be
A:
20 MHz
B:
50 MHz
C:
14.3 MHz
D:
5 MHz
Answer: C

Maximum delay = 50 + 20 = 70 x 10-9 s.

Hence .

Which of the following binary numbers is equivalent to decimal 10?
A:
1000
B:
1100
C:
1010
D:
1001
Answer: C

1010 = 8 + 0 + 2 + 0 = 10.

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