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Print Noise Summary. What is the noise unit for currents?

Clidre

Hello everybody,

I am comparing my noise simulations with the calculations.

If I print the noise summary (spot noise), I can select either V^2 or V.

By selecting V^2, at the end of the printed list there is this sentence:

"Spot noise Summary (in V^2/Hz)..."

However, in the printed list there are current noise densities as well (id, igs, igd, igb).

For example, i get

id    4.60029e-15

What is the unit for these current densities? Should I interpret it as  A^2/Hz? Or is it multiplied by something to get the unit V^2/Hz? 

Thanks!

  • These are output-referred noise contributors. So they are in the same units as the output referred total noise.This will be the part of the total output noise that is caused by the drain current noise (if id) of each transistor. The simulator calculates the noise at the source (which would be a current then) and multiplies it by the transfer function to the output to give the amount of noise at the output caused by that noise source.

    Regards,

    Andrew.

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