Question

1. Given a dc bias of 0.5mA and a bandwidth of 10 kHz, calculate for the noise current.

Answer 1

Root mean square value of the shot noise current i_n is given by the Schotty formula:

I_n=$\sqrt{2\Iota{q}\Delta\Beta}$

Where:

$\Iota$ =Dc current in Amperes

q= charge of an electron in Coulombs

$\Delta$$\Beta$ = the bandwidth in Hertz

Substituting

I_n= $\sqrt{2×0.5×10^{-3}×1.602×10^{-19}×10×10^3}$

$\sqrt{2×0.5×10^{-3}×1.602×10^{-19}×10×10^3}$

I_n =1.266$×10^{-9}A$

=1.266nA