Timing Diagrams — A graph of voltage (or logic level) versus time for one or more signals is called a timing diagram. Evaluate the statement.
-
ACorrect
-
BIncorrect
-
CTrue only for analog waveforms
-
DOnly when plotted in the frequency domain
Answer
Correct Answer: Correct
Explanation
Introduction: Timing diagrams are the primary way to visualize relationships among digital signals—setup/hold windows, propagation delays, pulse widths, and inter-signal timing constraints. This statement asks you to recognize that a voltage- (or level-) vs time plot is precisely a timing diagram.Given Data / Assumptions:
- Axes: time on the horizontal; voltage/logic level on the vertical.
- Signals may include clocks, data, enables, resets.
- Idealized or simulated waveforms are acceptable.
Concept / Approach: A timing diagram captures temporal behavior—edges, widths, skew, and causality between signals—making it distinct from frequency-domain plots (spectra) and static DC transfer curves. It is used for specification (datasheets) and verification (simulation outputs).Step-by-Step Solution:
1) Identify the plotted quantity (voltage/level) and the time axis.2) Confirm event sequencing (rising/falling edges, pulse timing).3) Recognize cross-signal relationships (e.g., data valid relative to clock).Verification / Alternative check:
Compare with an oscilloscope/simulator waveform window; both are timing diagrams when plotted vs time.Why Other Options Are Wrong:
Incorrect: The definition matches standard usage.True only for analog waveforms: Digital levels vs time are also timing diagrams.Only when plotted in the frequency domain: Frequency-domain plots are not timing diagrams.Common Pitfalls:
Confusing eye diagrams (statistical overlays) with general timing diagrams.Ignoring that multiple signals may be stacked in one diagram.Final Answer:
Correct