diff --git a/2118-2128.tex b/2118-2128.tex
index c03b032..e5cf340 100644
--- a/2118-2128.tex
+++ b/2118-2128.tex
@@ -67,6 +67,7 @@ The card support a minimum pulse width of 3ns.
 
 \newcommand*{\MyLabel}[3][2cm]{\parbox{#1}{\centering #2 \\ #3}}
 \newcommand*{\MymyLabel}[3][4cm]{\parbox{#1}{\centering #2 \\ #3}}
+\newcommand{\repeatfootnote}[1]{\textsuperscript{\ref{#1}}}
 
 \begin{figure}[h]
     \centering
@@ -341,7 +342,8 @@ The card support a minimum pulse width of 3ns.
 
 \section{Electrical Specifications}
 All specifications are in $0\degree C \leq T_A \leq 70\degree C$ unless otherwise noted.
-Pulse width distortion \& peak jitters are based on the isolator IC (SI8651BB-B-IS1), other specifications are based on the bus transceivers IC (SN74BCT25245DW).
+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}).
 
 \begin{table}[h]
 \begin{threeparttable}
@@ -351,15 +353,15 @@ Pulse width distortion \& peak jitters are based on the isolator IC (SI8651BB-B-
     \textbf{Parameter} & \textbf{Symbol} & \textbf{Min.} & \textbf{Typ.} & \textbf{Max.} &
     \textbf{Unit} & \textbf{Conditions} \\
     \hline
-    High-level input voltage & $V_{IH}$ & 2 &  &  & V &  \\
+    High-level input voltage\repeatfootnote{transceiver} & $V_{IH}$ & 2 &  &  & V &  \\
     \hline
-    Low-level input voltage & $V_{IL}$ & & & 0.8 & V & \\
+    Low-level input voltage\repeatfootnote{transceiver} & $V_{IL}$ & & & 0.8 & V & \\
     \hline
-    Input clamp current & $I_{OH}$ & & & -18 & mA & termination disabled \\
+    Input clamp current\repeatfootnote{transceiver} & $I_{OH}$ & & & -18 & mA & termination disabled \\
     \hline
-    High-level output current & $I_{OH}$ & & & -160 & mA & \\
+    High-level output current\repeatfootnote{transceiver} & $I_{OH}$ & & & -160 & mA & \\
     \hline
-    Low-level output current & $I_{OL}$ & & & 376 & mA & \\
+    Low-level output current\repeatfootnote{transceiver} & $I_{OL}$ & & & 376 & mA & \\
     \thickhline
 \end{tabularx}
 \end{threeparttable}
@@ -373,15 +375,15 @@ Pulse width distortion \& peak jitters are based on the isolator IC (SI8651BB-B-
     \textbf{Parameter} & \textbf{Symbol} & \textbf{Min.} & \textbf{Typ.} & \textbf{Max.} &
     \textbf{Unit} & \textbf{Conditions} \\
     \hline
-    High-level output voltage & $V_{OH}$ & 2 &  &  & V & $I_{OH}$=-160mA \\
+    High-level output voltage\repeatfootnote{transceiver} & $V_{OH}$ & 2 &  &  & V & $I_{OH}$=-160mA \\
      &  & 2.7 &  &  & V & $I_{OH}$=-6mA \\
     \hline
-    Low-level output voltage & $V_{OL}$ & & 0.42 & 0.55 & V & $I_{OL}$=188mA \\
+    Low-level output voltage\repeatfootnote{transceiver} & $V_{OL}$ & & 0.42 & 0.55 & V & $I_{OL}$=188mA \\
     &  &  &  & 0.7 & V & $I_{OL}$=376mA \\
     \hline
-    Pulse width distortion & $PWD$ & & 0.2 & 4.5 & ns &  \\
+    Pulse width distortion\repeatfootnote{isolator} & $PWD$ & & 0.2 & 4.5 & ns &  \\
     \hline
-    Peak jitter & $T_{JIT(PK)}$ & & 350 & & ps &  \\
+    Peak jitter\repeatfootnote{isolator} & $T_{JIT(PK)}$ & & 350 & & ps &  \\
     \thickhline
 \end{tabularx}
 \end{threeparttable}