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Madeline Horn edited section_Shot_Noise_textbf_You__.tex
over 8 years ago
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\textbf{}\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 $i_{\textrm{dc}}$
\textbf{The next paragraph has important information for someone trying to reproduce your results, but do you think they would be able to understand it as is if they had not already performed the experiment? Think about what they need to know first to be able to make use of this information. Also, consider first providing a clearer, more conceptual circuit diagram (such as 3-1b or 3-3a, depending on what circuit you actually used) and explaining what it does. }
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 $10 k \Omega$, a Gain (G1) of $\times100$ 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 $\times5000$, to $\times4000$, and finally to $\times3000$. 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.
