Assertion (logic design): “A popular waveform generator is the Johnson shift counter.” Select the most appropriate evaluation.
-
ACorrect
-
BIncorrect
-
CPartially correct under special cases
-
DAmbiguous statement
-
EInsufficient information
Answer
Correct Answer: Incorrect
Explanation
Introduction / Context:This statement mixes up roles. Johnson (twisted-ring) counters generate sequences of states and are excellent for timing/sequence generation, but the commonly cited popular general-purpose waveform generator in basic electronics is the 555 timer or function generator ICs.
Given Data / Assumptions:
- “Popular waveform generator” generally means a device used to create analog waveforms like square/triangle/sawtooth.
- Johnson counter is a digital sequential circuit.
Concept / Approach:Johnson counters circulate a pattern through flip-flops to produce non-overlapping timing signals. They are not standard analog waveform generator ICs. Thus the claim is not correct in the usual sense taught at this level.
Step-by-Step Solution:
Step 1: Define “waveform generator” in context (often analog/function generation).Step 2: Identify Johnson counter as a digital counter/sequencer.Step 3: Conclude the statement is incorrect.Verification / Alternative check:Compare typical lab instruments/ICs: 555 timer, XR2206, ICL8038, or DDS devices are taught as waveform generators, not Johnson counters.
Why Other Options Are Wrong:
Correct: Conflicts with the standard classification.Partially correct under special cases: Even though counters can drive digital patterns, this does not make them “popular waveform generators.”Ambiguous statement / Insufficient information: The wording is sufficiently clear to judge as incorrect.Common Pitfalls:Assuming any periodic digital sequence source is a “waveform generator.” The term is broader and usually analog-focused at this level.
Final Answer:Incorrect