diff --git a/opamp_circuits_C_GARRETT/Makefile b/opamp_circuits_C_GARRETT/Makefile
index d75d01d..b7b1f86 100644
--- a/opamp_circuits_C_GARRETT/Makefile
+++ b/opamp_circuits_C_GARRETT/Makefile
@@ -1,6 +1,6 @@
 
 
-PNG_DIA = circuit1_dag.png mvampcircuit.png pd.png invamp.png shared_component.png tree_abstraction_levels.png three_tree.png blockdiagramcircuit2.png circuit2h.png
+PNG_DIA = circuit1_dag.png mvampcircuit.png pd.png invamp.png shared_component.png tree_abstraction_levels.png three_tree.png blockdiagramcircuit2.png circuit2h.png bubba_oscillator_block_diagram.png
 
 
 
diff --git a/opamp_circuits_C_GARRETT/bubba_oscillator_block_diagram.dia b/opamp_circuits_C_GARRETT/bubba_oscillator_block_diagram.dia
new file mode 100644
index 0000000..a14e27e
Binary files /dev/null and b/opamp_circuits_C_GARRETT/bubba_oscillator_block_diagram.dia differ
diff --git a/opamp_circuits_C_GARRETT/opamps.tex b/opamp_circuits_C_GARRETT/opamps.tex
index c645475..64cac4d 100644
--- a/opamp_circuits_C_GARRETT/opamps.tex
+++ b/opamp_circuits_C_GARRETT/opamps.tex
@@ -138,6 +138,8 @@ $$ fm(NI\_AMP) = \{  {lowpass}, {high}, {low} \}.$$
 
 \section{Inverting OPAMP}
 
+\label{sec:invamp}
+
 \begin{figure}[h]
  \centering
  \includegraphics[width=200pt]{./invamp.png}
@@ -766,6 +768,42 @@ could be easily detected; the failure symptom $FilterIncorrect$  may be less obs
 %\clearpage
 %\section{Standard Non-inverting OP AMP}
 
+This circuit is described in the Analog Applications Journal~\cite{bubba}.
+The circuit uses four 45 degree phase shifts, and an inverting amplifier to provide
+gain and the final 180 degrees of phase shift.
+
+We identifiy three functional groups, the inverting amplifer (analysed in section~\ref{fig:invamp}),
+a 45 degree phase shifter (a {$10k\Omega$} resistor and a $10nF$ capacitor) and a noninverting buffer
+amplifier. We can name these $INVAMP$, $PHS45$ and $NIBUFF$ respectively.
+We can use these {\fgs} to describe the circuit in block diagram form, as in figure ~\ref{fig:bubbablock}.
+
+\begin{figure}[h]
+ \centering
+ \includegraphics[width=300pt,keepaspectratio=true]{./bubba_oscillator_block_diagram.png}
+ % bubba_oscillator_block_diagram.png: 720x295 pixel, 72dpi, 25.40x10.41 cm, bb=0 0 720 295
+ \caption{Circuit 3: Functional Group Block Diagram.}
+ \label{fig:bubbablock}
+\end{figure}
+
+We can now analyse each of these {\fgs} and create failure mode models for them, and from these
+determine {\dcs}.
+
+\subsection{Inverting Amplifier: INVAMP}
+This has been analysed in section~\ref{sec:invamp}.
+The inverting amplifier, as a {\dc}, has the following failure modes:
+
+$$ fm(INVAMP) = \{ OUT OF RANGE, ZERO OUTPUT,  NO GAIN, LOW PASS \} $$
+
+
+
+\subsection{Phase shifter: PHS45}
+
+\subsection{Non Inverting Buffer: NIBUFF}
+
+
+
+\subsection{Bringing the functional Groups Together: The `Bubba' Oscillator}
+
 
 \clearpage
 \section{Basic Concepts Of FMMD}