Nathanael A. Fortune edited subsection_Shot_Noise_To_perform__.tex  over 8 years ago

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\section{Shot Noise}  \textbf{You need an equation here for Shot Noise and a SECOND EQUATION that explains} how to convert from voltage measurements to current values, because Shot noise is a measure of fluctuations in CURRENT $<\delta i^2(t)>$ for a given average dc CURRENT $i_{\textrm{dc}}$  To perform the Shot Noise Experiment, we used the Noise Fundamentals devices and two digital multi-meters. Our settings for the Noise Fundamentals devices were as follows: we used the trans-impedance amplifier with a resistance of $10$ K ohm, a Gain (G1) of $100$ through the preamp, we used a bandwidth of $100$ KHz which has an equivalent noise bandwidth of $115.303$ KHz, and we varied the voltage across the photo-diode from $0$ to $-120 \textrm{ mV}$. To avoid saturating the values of Vsq (read from the multimeter attached after the signal ($V_{sq}$) went through the filter, the gain, and the multiplier) we had to vary the gain (G2) from $5000$, to $4000$, and finally to $3000$. Our multiplier had a setting of AxA because we needed to square the signal. We recorded the Vsq values in Volts and we recorded the V across the photo-diode in mV. $V_{sq}$ is the signal that has been filtered.