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A Scrapbook of Digital Signal Processing

Slew Rate

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.

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