\documentclass{beamer}
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\begin{document}
  \begin{frame}
    \frametitle{Kelvin Ly}
    Hi Neocis!
  \end{frame}
  \begin{frame}
    \frametitle{Introduction}
    \begin{itemize}
      \item BSEE and MsEE at University of Central Florida
      \begin{itemize}
        \item Research work in hardware security
        \item PCB design, FPGA work
      \end{itemize}
      \item Electrical engineer at STERIS IMS
      \begin{itemize}
        \item Reverse engineering medical devices
        \item Design, layout, testing of replacement PCBAs
        \item High speed, some high density, FPGA
        \item Tons of protocols (SPI, I2C, UART, SWI, SWD, SBW, USB 2.0, JTAG, MIPI CSI-2, HyperRAM, NFC Type V)
        \item FPGA stuff, image processing
      \end{itemize}
      \item Side jobs/projects
      \begin{itemize}
        \item A little bit of everything
        \item Two side jobs
        \begin{itemize}
          \item Fluorometric Instruments, industrial chemical sensors
          \item Cassina Technologies, company one of my coworkers runs on the side
        \end{itemize}
        \item Mixed signal design, FPGA, some RF design
        \item Working on the mechanical design for a CNC right now
      \end{itemize}
    \end{itemize}
  \end{frame}
  \begin{frame}
    \frametitle{Optical communications project}
    \begin{itemize}
      \item I designed this years ago, hindsight is 20-20
      \item Design parameters
      \begin{itemize}
        \item Low bitrate unidirectional communication
        \item Moderate range
        \item White LED for transmitter, photodiode as receiver
        \item USB interface
      \end{itemize}
      \item Objectives
      \begin{itemize}
        \item High dynamic range (want to be very tolerant of beam angle)
        \item Huge emphasis on noise analysis
        \item Highly flexible (I have no idea what I'm doing and I don't want to pay for a second board spin)
        \item Let's do a lot of signal processing because I don't know a lot of that
      \end{itemize}
    \end{itemize}
  \end{frame}
  \begin{frame}
    \frametitle{Front end}
    \begin{columns}
      \begin{column}{0.4\textwidth}
        \begin{figure}
          \includegraphics[angle=270, bb=0.5in 1.8in 5in 5.4in, scale=0.5, clip]{receiver-Photodiode.eps}
        \end{figure}
      \end{column}
      \begin{column}{0.6\textwidth}
        \begin{itemize}
          \item Largely based on Chapter 18 of Building Electro-optical Systems by Philips C. D. Hobbs
          \item Also Analog Devices Design Note 399
          \item TIA with some extra bells and whistles
          \item Lots of noise analysis, some stability analysis
          \item BJTs act to remove voltage offset
          \item JFET acts as a low noise bootstrap to reduce effect of photodiode capacitance 
        \end{itemize}
      \end{column}
    \end{columns}
  \end{frame}
  \begin{frame}
    \frametitle{Way too many amplifier stages}
    \begin{figure}
    \centerline{
    \includegraphics[angle=270, bb=0.5in 4.9in 5in 11.3in, scale=0.5, clip]{receiver-Photodiode.eps}
    }
    \end{figure}
  \end{frame}
  \begin{frame}
    \frametitle{Way too many amplifier stages}
    \begin{itemize}
      \item Lots of gain on the front so that the added noise is minimized
      \item Lots of adjustable gain and rudimentary bandpass filtering
      \item ATtiny412 setting gain on the JFET stage
    \end{itemize}
  \end{frame}
  \begin{frame}
    \frametitle{Digital side}
    \includegraphics[angle=270, scale=0.3, bb=0.5in 0.5in 7.3in 11.2in, clip]{receiver-Digital.eps}
    \begin{itemize}
      \item 12-bit discrete ADC into STM32 micro
      \item USB interface directly from STM32 micro, useful for high bitrate of ADC channel
    \end{itemize}
  \end{frame}
  \begin{frame}
    \frametitle{Lessons learned}
    \begin{itemize}
      \item Debuggability is an important design factor
      \item Less is more
      \item Break projects into smaller steps
      \item Questions?
    \end{itemize}
  \end{frame}

\end{document}
