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Rise Time Formula

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Rise Time is defined as the time required for a pulse to rise from 10 per cent to 90 per cent of its steady value in CMOS devices. Check FAQs

t r = 2 \cdot t e - t f

t_r - Rise Time?t_e - Edge Rate?t_f - Fall Time?

Rise Time Example

With values

With units

Only example

Here is how the Rise Time equation looks like with Values.

Here is how the Rise Time equation looks like with Units.

Here is how the Rise Time equation looks like.

2.8 = 2 \cdot 6 - 9.2

2.8ns = 2 \cdot 6ns - 9.2ns

2.8 = 2 \cdot 6 - 9.2

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Rise Time Solution

Follow our step by step solution on how to calculate Rise Time?

FIRST Step Consider the formula

t r = 2 \cdot t e - t f

Next Step Substitute values of Variables

∴

t r = 2 \cdot 6ns - 9.2ns

Next Step Convert Units

∴

t r = 2 \cdot 6E-9s - 9.2E-9s

Next Step Prepare to Evaluate

∴

t r = 2 \cdot 6E-9 - 9.2E-9

Next Step Evaluate

∴

t r = 2.8E-09s

LAST Step Convert to Output's Unit

∴

t r = 2.8ns

Rise Time Formula Elements

Variables

Rise Time

Rise Time is defined as the time required for a pulse to rise from 10 per cent to 90 per cent of its steady value in CMOS devices.

Symbol: t_r

Measurement: TimeUnit: ns

Note: Value should be greater than 0.

Formulas to find Rise Time

Edge Rate

Edge rate is defined as the ratio of rise time to the fall time.

Symbol: t_e

Measurement: TimeUnit: ns

Note: Value should be greater than 0.

Formulas to find Edge Rate

Fall Time

Fall time is time for a waveform to fall from 80% to 20% of its steady-state value.

Symbol: t_f

Measurement: TimeUnit: ns

Note: Value should be greater than 0.

Formulas to find Fall Time

Other formulas in CMOS Delay Characteristics category

Go Edge Rate

t e = \frac{t r + t f}{2}

Go Fall Time

t f = 2 \cdot t e - t r

Go Normalized Delay

d = \frac{t pd}{t c}

Go Propagation Delay

t pd = d \cdot t c

How to Evaluate Rise Time?

Rise Time evaluator uses Rise Time = 2*Edge Rate-Fall Time to evaluate the Rise Time, Rise time refers to the time it takes for the output voltage of a digital signal to transition from a low logic level (logic '0') to a high logic level (logic '1') during a rising transition. It is a critical parameter that impacts the speed, performance, and signal integrity of CMOS digital circuits. Rise Time is denoted by t_r symbol.

How to evaluate Rise Time using this online evaluator? To use this online evaluator for Rise Time, enter Edge Rate (t_e) & Fall Time (t_f) and hit the calculate button.

FAQs on Rise Time

What is the formula to find Rise Time?

The formula of Rise Time is expressed as Rise Time = 2*Edge Rate-Fall Time. Here is an example- 5.5E+9 = 2*6E-09-9.2E-09.

How to calculate Rise Time?

With Edge Rate (t_e) & Fall Time (t_f) we can find Rise Time using the formula - Rise Time = 2*Edge Rate-Fall Time.

Can the Rise Time be negative?

No, the Rise Time, measured in Time cannot be negative.

Which unit is used to measure Rise Time?

Rise Time is usually measured using the Nanosecond[ns] for Time. Second[ns], Millisecond[ns], Microsecond[ns] are the few other units in which Rise Time can be measured.

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Rise Time Formula

Rise Time Example

Rise Time Solution

Rise Time Formula Elements

Other formulas in CMOS Delay Characteristics category

How to Evaluate Rise Time?

FAQs on Rise Time

Variable Name