Square Wave Simulation: Fundamental Frequency, Harmonics, and Phase Shift

An oscilloscope's bandwidth specification typically refers to its ability to accurately display sine waves.
The bandwidth specification is usually defined as the frequency at which the amplitude of a sine wave is attenuated to a certain percentage of its original value, often 70.7% (-3 dB).
Square waves, being composed of multiple harmonics, require a higher bandwidth scope to accurately represent their fast edge transitions.
The quality of the square wave is determined by the number of harmonics present.
Software: Sqare Wave Simulatror from UltraCAD Design, Inc