diff --git a/Final.tex b/Final.tex
index 59681ba..2610b36 100644
--- a/Final.tex
+++ b/Final.tex
@@ -11,6 +11,7 @@
 \usepackage{longtable,booktabs,array}
 \usepackage{caption}
 \usepackage{xcolor}
+\usepackage{siunitx}
 \usepackage{circuitikz}
 \def\BibTeX{{\rm B\kern-.05em{\sc i\kern-.025em b}\kern-.08em
     T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}
@@ -42,11 +43,31 @@ op-amp, filter, signaling
 \end{IEEEkeywords}
 
 \section{Introduction}
-TODO some basic description and foreshadowing
+The operational amplifier is one of the most important building blocks
+in electronic circuits. Discrete op-amp integrated circuits (ICs) are
+produced by nearly every general semiconductor manufacturer, but not
+all op-amps perform equally.
 
-TODO List out some selected op-amps
+In this paper, a simple high-pass filter design based on an op-amp is
+introduced, and used to review a particular property of the op-amp: the
+frequency response of the open-loop gain.
+
+One of the most well-known op-amps is the LM741. In no small part to
+demonstrate the weakness of the LM741 design, a cutoff frequency of
+\SI{100}{kHz} is selected for the high-pass filter design. To compare, three
+other op-amp designs are selected beyond the LM741:
+
+\begin{enumerate}
+\item
+  The TI TL08x series op-amp,
+\item
+  The TI OPA818 op-amp, and
+\item
+  The ``ideal'' op-amp.
+\end{enumerate}
+
+TODO Lead into circuit analysis
 
-TODO Lead into circuit analysis TBD
 \section{TODO rename: circuit analysis section}
 
 TODO Describe the circuit