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Propagation Time Formula

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Propagation Time refers to the time it takes for a signal to propagate through the transistor from the input to the output. Check FAQs

T p = 0.7 \cdot N \cdot (\frac{N + 1}{2}) \cdot R m \cdot C l

T_p - Propagation Time?N - Number of Pass Transistors?R_m - Resistance in MOSFET?C_l - Load Capacitance?

Propagation Time Example

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With units

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

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

Here is how the Propagation Time equation looks like.

0.7782 = 0.7 \cdot 13 \cdot (\frac{13 + 1}{2}) \cdot 542 \cdot 22.54

0.7782s = 0.7 \cdot 13 \cdot (\frac{13 + 1}{2}) \cdot 542Ω \cdot 22.54μF

0.7782 = 0.7 \cdot 13 \cdot (\frac{13 + 1}{2}) \cdot 542 \cdot 22.54

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Propagation Time Solution

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

FIRST Step Consider the formula

T p = 0.7 \cdot N \cdot (\frac{N + 1}{2}) \cdot R m \cdot C l

Next Step Substitute values of Variables

∴

T p = 0.7 \cdot 13 \cdot (\frac{13 + 1}{2}) \cdot 542Ω \cdot 22.54μF

Next Step Convert Units

∴

T p = 0.7 \cdot 13 \cdot (\frac{13 + 1}{2}) \cdot 542Ω \cdot 2.3E-5F

Next Step Prepare to Evaluate

∴

T p = 0.7 \cdot 13 \cdot (\frac{13 + 1}{2}) \cdot 542 \cdot 2.3E-5

Next Step Evaluate

∴

T p = 0.778202516s

LAST Step Rounding Answer

∴

T p = 0.7782s

Propagation Time Formula Elements

Variables

Propagation Time

Propagation Time refers to the time it takes for a signal to propagate through the transistor from the input to the output.

Symbol: T_p

Measurement: TimeUnit: s

Note: Value should be greater than 0.

Formulas to find Propagation Time

Number of Pass Transistors

Number of Pass Transistors is number of transistors used to transfer signals from one part of the circuit to another.

Symbol: N

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Number of Pass Transistors

Resistance in MOSFET

Resistance in MOSFET refers to the opposition to the flow of current in the circuit.

Symbol: R_m

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Resistance in MOSFET

Load Capacitance

Load Capacitance refers to the total capacitance that a device sees at its output, typically due to the capacitance of connected loads and the traces on a printed circuit board (PCB).

Symbol: C_l

Measurement: CapacitanceUnit: μF

Note: Value should be greater than 0.

Formulas to find Load Capacitance

Other formulas in MOS IC Fabrication category

Go Body Effect in MOSFET

V t = V th + γ \cdot (\sqrt{2 \cdot Φ f + V bs} - \sqrt{2 \cdot Φ f})

Go MOSFET Unity-Gain Frequency

f t = \frac{g m}{C gs + C gd}

Go Drain Current of MOSFET at Saturation Region

I d = \frac{β}{2} \cdot {(V gs - V th)}^{2} \cdot (1 + λ i \cdot V ds)

Go Channel Resistance

R ch = \frac{L t}{W t} \cdot \frac{1}{μ n \cdot Q on}

How to Evaluate Propagation Time?

Propagation Time evaluator uses Propagation Time = 0.7*Number of Pass Transistors*((Number of Pass Transistors+1)/2)*Resistance in MOSFET*Load Capacitance to evaluate the Propagation Time, The Propagation Time refers to the time it takes for a signal to propagate through the transistor from the input to the output. Propagation Time is denoted by T_p symbol.

How to evaluate Propagation Time using this online evaluator? To use this online evaluator for Propagation Time, enter Number of Pass Transistors (N), Resistance in MOSFET (R_m) & Load Capacitance (C_l) and hit the calculate button.

FAQs on Propagation Time

What is the formula to find Propagation Time?

The formula of Propagation Time is expressed as Propagation Time = 0.7*Number of Pass Transistors*((Number of Pass Transistors+1)/2)*Resistance in MOSFET*Load Capacitance. Here is an example- 0.778203 = 0.7*13*((13+1)/2)*542*2.254E-05.

How to calculate Propagation Time?

With Number of Pass Transistors (N), Resistance in MOSFET (R_m) & Load Capacitance (C_l) we can find Propagation Time using the formula - Propagation Time = 0.7*Number of Pass Transistors*((Number of Pass Transistors+1)/2)*Resistance in MOSFET*Load Capacitance.

Can the Propagation Time be negative?

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

Which unit is used to measure Propagation Time?

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

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Propagation Time Formula

Propagation Time Example

Propagation Time Solution

Propagation Time Formula Elements

Other formulas in MOS IC Fabrication category

How to Evaluate Propagation Time?

FAQs on Propagation Time

Variable Name