Noise - SubThreshold.com

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Sub-threshold transistor noise analysis.

Thermal Noise (White Noise )

Saturation Region: $\frac{ \bar{i_n^2} }{\Delta f} = 2|q| I_d$ (Forward current only)
Linear Region: $\frac{ \bar{i_n^2} }{\Delta f} = 4|q| I_d$ (Forward and reverse current)
q is the charge on an electron, which is -1.602e-19 C

Flicker Noise

$\frac{ \bar{i_n^2} }{\Delta f} = \frac{K_f'}{ WL C_{ox} } \frac{ I_d^2 }{ f }$

K_f' is the flicker noise coefficient, a device constant. But may not be the same as the above threshold K_f
Note that I_d is squared, because in sub-threshold I_d must be very small, this makes flicker noise even smaller.

See Also:

Low Noise Design
Regions of Operation
AboveThreshold.Noise
Misc.Noise - General noise notes and noise of passive components

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Last edited by DrLock. Originally by DrLock.