n analyzing high speed digital signals, many factors depend upon the frequency of the signal. This includes, for example, the value of the impedance of the capacitance, signal path loss. Knee frequency is an estimate of the highest frequency content of the signal. It depends upon the rise time of the signal. If the rise time is smaller, the highest frequency content will have higher frequency. If t denotes the 10% to 90% rise time of a signal, then an estimate for the highest frequency content of the signal or the knee frequency is given by
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