Fall Time Calculator

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CMOS Delay Characteristics

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CMOS Time Characteristics

✖Edge rate is defined as the ratio of rise time to the fall time.ⓘ Edge Rate [t_e]			+10% -10%
✖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.ⓘ Rise Time [t_r]			+10% -10%

✖Fall time is time for a waveform to fall from 80% to 20% of its steady-state value.ⓘ Fall Time [t_f]

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Formula

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Fall Time

Formula

`"t"_{"f"} = 2*"t"_{"e"}-"t"_{"r"}`

Example

`"9.2ns"=2*"6ns"-"2.8ns"`

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Fall Time Solution

STEP 0: Pre-Calculation Summary

Formula Used

Fall Time = 2*Edge Rate-Rise Time
t_f = 2*t_e-t_r
This formula uses 3 Variables

Variables Used

Fall Time - (Measured in Second) - Fall time is time for a waveform to fall from 80% to 20% of its steady-state value.
Edge Rate - (Measured in Second) - Edge rate is defined as the ratio of rise time to the fall time.
Rise Time - (Measured in Second) - 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.

STEP 1: Convert Input(s) to Base Unit

Edge Rate: 6 Nanosecond --> 6E-09 Second (Check conversion here)
Rise Time: 2.8 Nanosecond --> 2.8E-09 Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

t_f = 2*t_e-t_r --> 2*6E-09-2.8E-09

Evaluating ... ...

t_f = 9.2E-09

STEP 3: Convert Result to Output's Unit

9.2E-09 Second -->9.2 Nanosecond (Check conversion here)

FINAL ANSWER

9.2 Nanosecond <-- Fall Time

(Calculation completed in 00.004 seconds)

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Created by Shobhit Dimri

Bipin Tripathi Kumaon Institute of Technology (BTKIT), Dwarahat

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< 13 CMOS Delay Characteristics Calculators

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Go Delay Rise = Intrinsic Rise Delay+(Rise Resistance*Delay Capacitance)+(Slope Rise*Delay Previous)

Delay of AND-OR Gate in Gray Cell

Go Delay of AND OR Gate = (Critical Path Delay-Total Propagation Delay-XOR Gate Delay)/(Gates on Critical Path-1)

Delay of 1-Bit Propagate Gates

Go Total Propagation Delay = Critical Path Delay-((Gates on Critical Path-1)*Delay of AND OR Gate+XOR Gate Delay)

Propagation Delay in Circuit

Go Circuit Propagation Delay = (Propagation Delay High to Low+Propagation Delay Low to High)/2

Propagation Delay without Parasitic Capacitance

Go Propagation Delay Capaitance = Circuit Propagation Delay/Normalized Delay

Propagation Delay

Go Total Propagation Delay = Normalized Delay*Propagation Delay Capaitance

Normalized Delay

Go Normalized Delay = Total Propagation Delay/Propagation Delay Capaitance

Voltage-Controlled Delay Line

Go Voltage-Controlled Delay Line = Small Deviation Delay/VCDL Gain

Small Deviation Delay

Go Small Deviation Delay = VCDL Gain*Voltage-Controlled Delay Line

VCDL Gain

Go VCDL Gain = Small Deviation Delay/Voltage-Controlled Delay Line

Edge Rate

Go Edge Rate = (Rise Time+Fall Time)/2

Fall Time

Go Fall Time = 2*Edge Rate-Rise Time

Rise Time

Go Rise Time = 2*Edge Rate-Fall Time

Fall Time Formula

Fall Time = 2*Edge Rate-Rise Time
t_f = 2*t_e-t_r

Explain sizing of the inverter.

Sizing of an inverter in digital circuit design involves determining the appropriate dimensions (width and length) of the transistors within the inverter circuit.

How to Calculate Fall Time?

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

How to calculate Fall Time using this online calculator? To use this online calculator for Fall Time, enter Edge Rate (t_e) & Rise Time (t_r) and hit the calculate button. Here is how the Fall Time calculation can be explained with given input values -> 9.2E+9 = 2*6E-09-2.8E-09.

FAQ

What is Fall Time?

The Fall time refers to the time it takes for the output voltage of a digital signal to transition from a high logic level (logic '1') to a low logic level (logic '0') during a falling transition. It is a critical parameter that affects the speed, performance, and signal integrity of CMOS digital circuits and is represented as t_f = 2*t_e-t_r or Fall Time = 2*Edge Rate-Rise Time. Edge rate is defined as the ratio of rise time to the fall 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.

How to calculate Fall Time?

The Fall time refers to the time it takes for the output voltage of a digital signal to transition from a high logic level (logic '1') to a low logic level (logic '0') during a falling transition. It is a critical parameter that affects the speed, performance, and signal integrity of CMOS digital circuits is calculated using Fall Time = 2*Edge Rate-Rise Time. To calculate Fall Time, you need Edge Rate (t_e) & Rise Time (t_r). With our tool, you need to enter the respective value for Edge Rate & Rise Time and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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