Topic: Digital Electronics
Which shift register counter requires the most decoding circuitry?
- A. Johnson Counter
- B. Ring Counter
- C. Ripple Counter
- D. MOD Counter
Answer: A. Johnson Counter
Explanation: For ripple and ring counters, the output state directly reflects the clock number (or count) in a relatively straightforward manner (binary or one-hot). Hence, decoder circuit design is easier. For a Johnson counter, the output states follow a twisted-ring sequence that does not reflect the binary count value directly. Therefore, its decoder circuit design requires more logic gates and becomes more complex.