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White Rabbit
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fa94b91f
Commit
fa94b91f
authored
Oct 04, 2017
by
Javier Serrano
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Changes after rehearsing with team mates
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wr_workshop_2017_intro.tex
...tions/WR_Javier_WRWS2017_Intro/wr_workshop_2017_intro.tex
+19
-18
wr_workshop_2017_high_precision.tex
...WS2017_high_precision/wr_workshop_2017_high_precision.tex
+11
-21
No files found.
presentations/WR_Javier_WRWS2017_Intro/wr_workshop_2017_intro.tex
View file @
fa94b91f
...
...
@@ -204,6 +204,7 @@ Rabbit\hspace{6em}\insertframenumber/\inserttotalframenumber]{White
\item
Layer 1 syntonization
\item
Digital Dual Mixer Time Difference (DDMTD)
\item
Link delay model
\item
WR-PTP (backward-compatible extension of PTP)
\end{itemize}
\end{block}
\end{frame}
...
...
@@ -299,19 +300,19 @@ Rabbit\hspace{6em}\insertframenumber/\inserttotalframenumber]{White
\end{center}
\end{frame}
%
\begin{frame}{Digital Dual Mixer Time Difference}{DDMTD}
\begin{frame}
{
Digital Dual Mixer Time Difference
}{
DDMTD
}
%
\begin{itemize}
%
\item Used for precise phase measurements
%
\item Implemented in FPGA and SoftPLL
%
\item 62.5MHz WR clock and N=14 results in 3.814kHz output signals
%
\end{itemize}
%
\vspace{-0.2cm}
%
\begin{center}
%
\includegraphics[width=\textwidth]{misc/dmtd_2N.pdf}
%
\end{center}
\begin{itemize}
\item
Used for precise phase measurements
\item
Implemented in FPGA and SoftPLL
\item
62.5MHz WR clock and N=14 results in 3.814kHz output signals
\end{itemize}
\vspace
{
-0.2cm
}
\begin{center}
\includegraphics
[width=\textwidth]
{
misc/dmtd
_
2N.pdf
}
\end{center}
%
\end{frame}
\end{frame}
% %\begin{frame}{Deglitching algorithm -- to backup slides?}
% %\end{frame}
...
...
@@ -368,13 +369,13 @@ Rabbit\hspace{6em}\insertframenumber/\inserttotalframenumber]{White
\end{center}
\end{frame}
\begin{frame}
{
Simplified block diagram of the gateware
}
\begin{center}
\begin{adjustwidth}
{
-1.5em
}{
-1.5em
}
\includegraphics
[width=1.1\textwidth]
{
switch/switch
_
hdl
_
simple.pdf
}
\end{adjustwidth}
\end{center}
\end{frame}
%
\begin{frame}{Simplified block diagram of the gateware}
%
\begin{center}
%
\begin{adjustwidth}{-1.5em}{-1.5em}
%
\includegraphics[width=1.1\textwidth]{switch/switch_hdl_simple.pdf}
%
\end{adjustwidth}
%
\end{center}
%
\end{frame}
\begin{frame}
{
WR Node: SPEC board
}
...
...
presentations/WR_Javier_WRWS2017_high_precision/wr_workshop_2017_high_precision.tex
View file @
fa94b91f
...
...
@@ -164,6 +164,16 @@ $ E(s) = 1 - H(s) = \frac{s}{s + K_{VCO} K_d F(s)} $
\includegraphics
[height=0.7\textwidth]
{
misc/pll
_
psd.pdf
}
}
\begin{frame}
{
How to drive the phase noise PSD curve down?
}
\begin{block}
{
Medium and high (Fourier) frequencies
}
Easy! Just buy a better oscillator. OCXO-based WR node in
development at CERN achieves 100fs jitter (100Hz-5MHz).
\end{block}
\begin{block}
{
Low (Fourier) frequencies
}
Tricky. Usually involves serious architectural changes. See later.
\end{block}
\end{frame}
\section
{
White Rabbit case
}
\subsection
{}
\begin{frame}
{
WR time transfer performance: basic test setup
}
...
...
@@ -182,15 +192,6 @@ $ E(s) = 1 - H(s) = \frac{s}{s + K_{VCO} K_d F(s)} $
\end{frame}
\begin{frame}
{
How to drive the phase noise PSD curve down?
}
\begin{block}
{
Medium and high (Fourier) frequencies
}
Easy! Just buy a better oscillator. OCXO-based node in development
at CERN achieves 100fs jitter (100Hz-5MHz).
\end{block}
\begin{block}
{
Low (Fourier) frequencies
}
Tricky. Usually involves serious architectural changes. See next.
\end{block}
\end{frame}
\begin{frame}
{
Digital Dual Mixer Time Difference
}{
DDMTD
}
\begin{itemize}
...
...
@@ -204,7 +205,7 @@ $ E(s) = 1 - H(s) = \frac{s}{s + K_{VCO} K_d F(s)} $
\end{center}
\end{frame}
\begin{frame}
{
Daughterboard Test Setup
}
\begin{frame}
{
Test setup for 10MHz switch output
}
\begin{center}
\includegraphics
[width=\textwidth]
{
measurements/WRSlowJitter/rsz
_
experimental
_
setup.png
}
\end{center}
...
...
@@ -248,17 +249,6 @@ $ E(s) = 1 - H(s) = \frac{s}{s + K_{VCO} K_d F(s)} $
\end{center}
\end{frame}
\begin{frame}
{
Test Results in Slave mode: PM noise
}
\begin{center}
\includegraphics
[height=.85\textheight]
{
measurements/WRSlowJitter/slave
_
pn.png
}
\end{center}
\end{frame}
\begin{frame}
{
Test Results in Slave mode: Modified ADEV
}
\begin{center}
\includegraphics
[height=.85\textheight]
{
measurements/WRSlowJitter/slave
_
mdev.png
}
\end{center}
\end{frame}
\begin{frame}
{
Need more information?
}
\begin{center}
...
...
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