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2118-2128: add min pulse width spec 

Especially test reuslt that validate the "minimum 3ns pulse width" claim.
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occheung 2022-02-08 13:33:53 +08:00
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2118-2128.tex
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@ -347,6 +347,7 @@ The card support a minimum pulse width of 3ns.
All specifications are in $0\degree C \leq T_A \leq 70\degree C$ unless otherwise noted.
Specifications are based on the bus transceivers IC (SN74BCT25245DW\footnote{\label{transceiver}https://www.ti.com/lit/ds/symlink/sn74bct25245.pdf})
and the isolator IC (SI8651BB-B-IS1\footnote{\label{isolator}https://www.skyworksinc.com/-/media/Skyworks/SL/documents/public/data-sheets/si865x-datasheet.pdf}).
The typical value of minimum pulse width is based on test results\footnote{\label{sinara187}https://github.com/sinara-hw/sinara/issues/187}.
\begin{table}[h]
\begin{threeparttable}
@ -385,6 +386,8 @@ and the isolator IC (SI8651BB-B-IS1\footnote{\label{isolator}https://www.skywork
Low-level output voltage\repeatfootnote{transceiver} & $V_{OL}$ & & 0.42 & 0.55 & V & $I_{OL}$=188mA \\
& & & & 0.7 & V & $I_{OL}$=376mA \\
\hline
Minimum pulse width\repeatfootnote{isolator}\textsuperscript{,}\repeatfootnote{sinara187} & & & 3 & 5 & ns & \\
\hline
Pulse width distortion\repeatfootnote{isolator} & $PWD$ & & 0.2 & 4.5 & ns & \\
\hline
Peak jitter\repeatfootnote{isolator} & $T_{JIT(PK)}$ & & 350 & & ps & \\
@ -397,6 +400,23 @@ and the isolator IC (SI8651BB-B-IS1\footnote{\label{isolator}https://www.skywork
\newpage
Minimum pulse width was measured\repeatfootnote{sinara187}.
Pulses were generated from a DDS generator as an input of a BNC-TTL card.
The input BNC-TTL card is connected to another BNC-TTL card as an output.
The output signal is measured and shown.
\begin{figure}[h]
\centering
\includegraphics[height=3in]{bnc_ttl_min_pulse_width.png}
\caption{Minimum pulse width required for BNC-TTL card}
\end{figure}
The red trace refers to the input pulses from the DDS generator, while the blue trace is the measured signal from the output BNC-TTL card.
Note that the first input (red) pulse could not propagate through the signal chain.
The first output (blue) pulse is the result of the second input (red, 3ns width) pulse.
\newpage
\section{Front Panel Drawings}
\begin{multicols}{2}