Capacitance of External Load Calculator

✖Fanout is the number of similar gate inputs that a gate output can drive. In other words, it represents the number of gates or loads connected to the output of the current gate.ⓘ Fanout [h]			+10% -10%
✖Input capacitance represents the capacitance seen at the input of the gate. It's the sum of all the capacitances associated with the gate's inputs.ⓘ Input Capacitance [C_in]			+10% -10%

✖The Capacitance of External Load is the amount of external circuit capacitance in parallel with the circuit itself.ⓘ Capacitance of External Load [C_out]

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Formula

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Capacitance of External Load

Formula

C out = h \cdot C in

Example

42 pF = 0.84 \cdot 50 pF

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Capacitance of External Load Solution

STEP 0: Pre-Calculation Summary

Formula Used

Capacitance of External Load = Fanout*Input Capacitance
C_out = h*C_in
This formula uses 3 Variables

Variables Used

Capacitance of External Load - (Measured in Farad) - The Capacitance of External Load is the amount of external circuit capacitance in parallel with the circuit itself.
Fanout - Fanout is the number of similar gate inputs that a gate output can drive. In other words, it represents the number of gates or loads connected to the output of the current gate.
Input Capacitance - (Measured in Farad) - Input capacitance represents the capacitance seen at the input of the gate. It's the sum of all the capacitances associated with the gate's inputs.

STEP 1: Convert Input(s) to Base Unit

Fanout: 0.84 --> No Conversion Required
Input Capacitance: 50 Picofarad --> 5E-11 Farad (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

C_out = h*C_in --> 0.84*5E-11

Evaluating ... ...

C_out = 4.2E-11

STEP 3: Convert Result to Output's Unit

4.2E-11 Farad -->42 Picofarad (Check conversion here)

FINAL ANSWER

42 Picofarad <-- Capacitance of External Load

(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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< CMOS Special Purpose Subsystem Calculators

Capacitance of External Load

Go Capacitance of External Load = Fanout*Input Capacitance

Fanout of Gate

Go Fanout = Stage Effort/Logical Effort

Stage Effort

Go Stage Effort = Fanout*Logical Effort

Gate Delay

Go Gate Delay = 2^(N Bit SRAM)

Capacitance of External Load Formula

Capacitance of External Load = Fanout*Input Capacitance
C_out = h*C_in

What do you know about linear delay model?

The RC delay model showed that delay is a linear function of the fanout of a gate. Based on this observation, designers further simplify delay analysis by characterizing a gate by the slope and y intercept of this function. The complexity is represented by the logical effort, g. More complex gates have greater logical efforts, indicating that they take longer to drive a given fanout. A gate driving h identical copies of itself is said to have a fanout or
electrical effort of h.

How to Calculate Capacitance of External Load?

Capacitance of External Load calculator uses Capacitance of External Load = Fanout*Input Capacitance to calculate the Capacitance of External Load, The Capacitance of External Load formula is defined amount of external circuit capacitance in parallel with crystal itself. Capacitance of External Load is denoted by C_out symbol.

How to calculate Capacitance of External Load using this online calculator? To use this online calculator for Capacitance of External Load, enter Fanout (h) & Input Capacitance (C_in) and hit the calculate button. Here is how the Capacitance of External Load calculation can be explained with given input values -> 4.2E+13 = 0.84*5E-11.

FAQ

What is Capacitance of External Load?

The Capacitance of External Load formula is defined amount of external circuit capacitance in parallel with crystal itself and is represented as C_out = h*C_in or Capacitance of External Load = Fanout*Input Capacitance. Fanout is the number of similar gate inputs that a gate output can drive. In other words, it represents the number of gates or loads connected to the output of the current gate & Input capacitance represents the capacitance seen at the input of the gate. It's the sum of all the capacitances associated with the gate's inputs.

How to calculate Capacitance of External Load?

The Capacitance of External Load formula is defined amount of external circuit capacitance in parallel with crystal itself is calculated using Capacitance of External Load = Fanout*Input Capacitance. To calculate Capacitance of External Load, you need Fanout (h) & Input Capacitance (C_in). With our tool, you need to enter the respective value for Fanout & Input Capacitance 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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