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Total Propagation delay typically refers to the rise time or fall time in logic gates. This is the time it takes for a logic gate to change its output state based on a change in the input state. Check FAQs
tpd=d⋅tc
tpd - Total Propagation Delay?d - Normalized Delay?tc - Propagation Delay Capaitance?

Propagation Delay Example

With values
With units
Only example

Here is how the Propagation Delay equation looks like with Values.

Here is how the Propagation Delay equation looks like with Units.

Here is how the Propagation Delay equation looks like.

70.9988Edit=221.18Edit⋅0.321Edit
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HomeIcon Home » Category Engineering » Category Electronics » Category CMOS Design and Applications » fx Propagation Delay

Propagation Delay Solution

Follow our step by step solution on how to calculate Propagation Delay?

FIRST Step Consider the formula
tpd=d⋅tc
Next Step Substitute values of Variables
∴ tpd=221.18⋅0.321ns
Next Step Convert Units
∴ tpd=221.18⋅3.2E-10s
Next Step Prepare to Evaluate
∴ tpd=221.18⋅3.2E-10
Next Step Evaluate
∴tpd=7.099878E-08s
Next Step Convert to Output's Unit
∴tpd=70.99878ns
LAST Step Rounding Answer
∴tpd=70.9988ns

Propagation Delay Formula Elements

Variables
Total Propagation Delay
Total Propagation delay typically refers to the rise time or fall time in logic gates. This is the time it takes for a logic gate to change its output state based on a change in the input state.
Symbol: tpd
Measurement: TimeUnit: ns
Note: Value should be greater than 0.
Formulas to find Total Propagation DelayOpen Variable
Normalized Delay
The Normalized delay is a measure used to compare the delay of a specific circuit or gate with the delay of a reference gate, often an ideal inverter.
Symbol: d
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Normalized DelayOpen Variable
Propagation Delay Capaitance
Propagation Delay Capaitance is the delay of an ideal fanout-of-1 inverter with no parasitic capacitance.
Symbol: tc
Measurement: TimeUnit: ns
Note: Value should be greater than 0.
Formulas to find Propagation Delay CapaitanceOpen Variable

Other Formulas to find Total Propagation Delay

​Go Delay of 1-Bit Propagate Gates
tpd=Tdelay-((Ngates-1)⋅tAO+tXOR)

Other formulas in CMOS Delay Characteristics category

​Go Edge Rate
te=tr+tf2
​Go Fall Time
tf=2⋅te-tr
​Go Rise Time
tr=2⋅te-tf
​Go Normalized Delay
d=tpdtc

How to Evaluate Propagation Delay?

Propagation Delay evaluator uses Total Propagation Delay = Normalized Delay*Propagation Delay Capaitance to evaluate the Total Propagation Delay, The Propagation delay formula is defined as the amount of time it takes for the head of the signal to travel from the sender to the receiver. Total Propagation Delay is denoted by tpd symbol.

How to evaluate Propagation Delay using this online evaluator? To use this online evaluator for Propagation Delay, enter Normalized Delay (d) & Propagation Delay Capaitance (tc) and hit the calculate button.

FAQs on Propagation Delay

What is the formula to find Propagation Delay?
The formula of Propagation Delay is expressed as Total Propagation Delay = Normalized Delay*Propagation Delay Capaitance. Here is an example- 8.1E+9 = 221.18*3.21E-10.
How to calculate Propagation Delay?
With Normalized Delay (d) & Propagation Delay Capaitance (tc) we can find Propagation Delay using the formula - Total Propagation Delay = Normalized Delay*Propagation Delay Capaitance.
What are the other ways to Calculate Total Propagation Delay?
Here are the different ways to Calculate Total Propagation Delay-
  • Total Propagation Delay=Critical Path Delay-((Gates on Critical Path-1)*Delay of AND OR Gate+XOR Gate Delay)OpenImg
Can the Propagation Delay be negative?
No, the Propagation Delay, measured in Time cannot be negative.
Which unit is used to measure Propagation Delay?
Propagation Delay is usually measured using the Nanosecond[ns] for Time. Second[ns], Millisecond[ns], Microsecond[ns] are the few other units in which Propagation Delay can be measured.
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