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Slew rate is computed as the derivative of the time function. Of greatest interest is usually the maximum slew rate that can be encountered. If a time series is considered as being comprised of its Fourier components, then the maximum slew rate is at the zero crossing of the highest large-signal sine function. This is given by:
d/dt (A sin (2 pi f t) ) = 2 pi A f cos (2 pi f 0) = 6.28 A f
The "large-signal" component must be considered because the amplitude A is a part of the slew-rate expression. As an example, a sine-wave of 1-volt maximum amplitude at a frequency of 1 MHz has a maximum slew rate of 6.28 volts/microsecond.