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What is frequency of the pulse at point a, b, c, d in circuit?
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- 20 Hz, 500 Hz, 33.25 Hz, 3.9 Hz
- 10 kHz, 500 Hz, 31.25 Hz, 3.9 Hz
- 10 Hz, 500 kHz, 31.25 kHz, 3.8 Hz
- 100 kHz, 50 kHz, 31.25 MHz, 3.6 Hz
Correct Option: B
∴ Ring counter is a N: 1 divider, where N = no. of bits.
| a = | = 10kHz | |
| 10 |
MOD 20 counter is a divided by 20 counter, so
| ∴ b = | = 500Hz | |
| 20 |
4 bit parallel counter ⇒ 4 flip-flop used
Hence, 24 = 16, stages i.e., MOD-16 counter, so.
| ∴ C = | = 31.25Hz | |
| 16 |
4 bit Johnson counter is a 2N: 1 divider, where N is the no. of bit
| ∴ d = | = 3.9Hz | |
| 8 |
Hence alternative (B) is the correct answer.
