Noise analysis without flicker noise

The values are the same as that of the previous assignment

The inversion coefficient $IC$ equals: 0.01251

The critical inversion coefficient $IC_{CRIT}$ equals: 12.76

The transconductance $g_m$ equals: 0.0001290

Source referred noise

The spectrum of the source-referred voltage noise [V/rt(Hz)] is: 9.873e-9

Here is the source refered noise.

But we want to know for which width we still have more noise than the minimum requirements.

At the minimum, we need to have less noise than $2.5$ nVHz$^{-0.5}$ (See the antenna requirements)

To calculate the minimum width, we plot the source refered input noise vs the width of the device. Note that the device is kept in critical inversion

From this we can read out that we have a showstopper. If $W < 7 \mu m$, the design will fail nonetheless. However, for wider widths the noise performance meets the requirements.

The optimum noise performance would be achieved if $C_s = c_{iss}$, which would result in a width of 2.5mm

For our current W/L ratio, we obtain a $C_{iss}$ of $8.7 \cdot 10^{-14}$ F

Although the width of 2.5mm is the optimum, such a large value is not needed for the noise requirements