# Early voltage And intrinsic resistance in Cadence

1. ## Early voltage And intrinsic resistance in Cadence

i am having problems in finding out the early voltage through graph !!!! i dont know what function to give in the calculator in cadence to find the exact value of early voltage !!!!!! Please if any one can give me an intuitive explanation of how to extrapolate the Id vs Vds graph to find the point at which the line cuts the x-axis to find Va

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2. ## Re: Early voltage And intrinsic resistance in Cadence

With C@dence' ADE calculator (use the derivative function) identify gds at your selected bias point, then calculate the Early voltage VA from the equation given in the figure below:

Binkley_Early_voltage_p131.pdf

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3. ## Re: Early voltage And intrinsic resistance in Cadence

Originally Posted by erikl
With C@dence' ADE calculator (use the derivative function) identify gds at your selected bias point, then calculate the Early voltage
If you don't like to calculate, I think it should be possible to determine the slope a of the curve via the simulator as a number.
Then, you can command to draw a linear function y=ax + b, where b is the current that corresponds to Vce=0.

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