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Term: Symmetry Definition: Symmetry is defined as the ratio of amount of time the voltage is in the logic “1” state compared to the time in the logic “0” state. The measurements are taken at the 50% points of the voltage transition between the two logic states. The time period of one cycle of the waveform is calculated first as below.
Next, the time period of the logic “1” state is measured from the 50% point of the waveform’s positive voltage transition to the 50% point of the waveform’s negative voltage transition, then compared to the total waveform period. The calculation for symmetry is shown below:
For the % symmetry of the logic “0” state, subtract the logic “1” symmetry from 100%. For example, 40/60% means that the waveform is in its logic “1” state 40% and in the logic “0” state 60% of the total waveform time period.
Cardinal Components
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