Digital Electronics - Digital Concepts - Discussion

In electronics, when describing a voltage or current step function, rise time refers to the time required for a signal to change from a specified low value to a specified high value. Typically, in analog electronics, these values are 10% and 90% of the step height: in control theory applications, according to Levine (1996, p. 158) , rise time is defined as "the time required for the response to rise from x% to y% of its final value", with 0%-100% rise time common for under damped second order systems, 5%-95% for critically damped and 10%-90% for over damped. [1] The output signal of a system is characterized also by fall time: both parameters depend on rise and fall times of input signal and on the characteristics of the system.

Why its not from 0-90 or 0-100% ?

Why rise point is from 10%?

Why not from the base line to 90%?

In control theory, for overdamped systems, rise time is commonly defined as the time for a waveform to go from 10% to 90% of its final value.

Thanks akansh.

(0 to 10) % of time is delay time because input pulse changed after some time output is changed so i.e. is delay time and 10%to 90%of time is rise time.

The rise time of a certain pulse is 5 microseconds if the amplitude of the pulse is 5v and its baseline 0v determine the actual change in voltage during the rise time.

I agree with you @Akansh.

Thank you for the explanation @Akansh.