From b476c178d0a7f2abb8e55daf10e6dfb5bb3864f7 Mon Sep 17 00:00:00 2001 From: occheung Date: Tue, 8 Feb 2022 13:33:53 +0800 Subject: [PATCH] 2118-2128: add min pulse width spec Especially test reuslt that validate the "minimum 3ns pulse width" claim. --- 2118-2128.tex | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/2118-2128.tex b/2118-2128.tex index affcc4a..beebe51 100644 --- a/2118-2128.tex +++ b/2118-2128.tex @@ -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}