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update 20180730

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acereca
2018-07-31 22:58:46 +02:00
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commit f9f2184e3e
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parts/experiments.tex
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@@ -171,7 +171,7 @@ Wanting to observe and characterize the voltage drop, happening between the Powe
\centering
\hspace*{-.16\columnwidth}
\includegraphics[width=1.3\columnwidth]{../pitstop/20180727/ret_vdip.pdf}
\caption{Voltage dip observed between PowerIt and HICANN, each point represents the state after enabling additional Reticles on the PowerWafer}
\caption{Voltage dip observed between PowerIt and HICANN, each point represents the state after enabling additional Reticles on the PowerWafer (\pyval{0})}
\label{1v8dip}
\end{figure}
parts/theory.tex
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@@ -16,21 +16,21 @@ Each of the three voltage regimes that will be observed on the PowerIt Board, ha
\end{figure}
The circuits for measuring input Voltage and current are the most complex, because for Voltage measurement the circuit needs to
\begin{enumerate}
\begin{itemize}
\item divide our input voltage into a usable potential range
\item decouple the input from our signal potential
\item operate within the Chips possible Voltage range of 0 -- 3.3V
\end{enumerate}
\end{itemize}
The already implemented Cicuit can be seen in figure \ref{mon48v}. It consists of a 1:240 Voltage Divider, a full differential operational amplifier taking in the ~200mV (nominal), and amplifying it by a factor of 8 ($r_\text{diffOpAmp}$). It is decoupling the input and output voltages, so our 48V and 3.3V circuit parts are electricly insulated. The remaining operational amplifier provides futher amplification by a factor of 1.1 ($r_\text{OpAmp}$)
The already implemented Cicuit can be seen in \autoref{mon48v}. It consists of a 1:240 Voltage Divider, a full differential operational amplifier taking in the ~200mV (nominal), and amplifying it by a factor of 8 ($r_\text{diffOpAmp}$). It is also decoupling the input and output voltages, so our 48V and 3.3V circuit parts are electricly insulated. The remaining operational amplifier provides futher amplification by a factor of 1.1 ($r_\text{OpAmp}$)
This circuit results in the following equation:
This circuit results in the following equation for calculating the input voltage from a pin voltage:
\begin{equation}
V_\text{48V in}\cdot\frac{R_1}{R_1+R_2} \cdot r_\text{diffOpAmp} \cdot r_\text{OpAmp} = V_\text{48V pin}
\end{equation}
% and the expected behavior, as seen in \ref{beh48v}
% and the expected behavior, as seen in \autoref{beh48v}
%
% \begin{figure}[h]
% \centering
@@ -120,12 +120,25 @@ Like its counterparts, it has the same Layout
and each of the 48 Reticles can be accessed, digitaly as well as electricaly.
For this work the following circuit can be used to describe the connections, powering these Reticles.
For this work the circuit model in \autoref{retmodel} can be used to describe the connections, powering these Reticles.
\begin{figure}[H]
\centering
%TODO: unclude simplified resistor ladder
\includegraphics[width=1.3\paperwidth]{<`4`>}
\caption{<`5`>}
\label{<`6`>}
\includegraphics[width=.4\columnwidth]{./tikz/reticlepower.pdf}
\caption{model of the to measure resistances and their currents, $R_0$ describes the resistance of a connection between the PowerIt Output and up to the switch, while $R_1$ is a Resistance between the switches and Reticles. }
\label{retmodel}
\end{figure}
This model allowes for two fixed resistance values and their respective currents. The current flowing through $R_1$ will be either 0 or a constant current $I_{ret}$. The current through $R_0$ will change depending on the number of reticles that are powered $n_{ret}$
\begin{align}
I_{ges} = n_{ret} \cdot I_{ret}
\end{align}
Therefore the voltage Differential as measured by a Voltmeter (\autoref{retmodel}) can be described as in \autoref{eq:vdip}
\begin{align} \label{eq:vdip}
V_{dip} =&\ V_{R_1} + V_{R_0} \nonumber\\
=&\ R_1 \cdot I_{ret} + R_0 \cdot I_{ges}(n_{ret}) \nonumber\\
=&\ I_{ret} \cdot \left( R_1 + R_0 \cdot n_{ret} \right)
\end{align}