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\author{Carlos Gil Soriano\\BE-CO-HT\\
\href{mailto:carlos.gil.soriano@cern.ch}{\textbf{\textit{carlos.gil.soriano@cern.ch}}}}
\title{\textbf{{\LARGE TTL Converter to 30V pulsed output Backplane}}}
\date{\today}

\begin{document}

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\paragraph{Acknowledgements}
This document agregates the functional and technical specifications of the
TTL to 30V pulsed output for the substitution of both 8 and 16 channel
repeaters. It has been carried out thanks to the help of
\href{mailto:Emmanuel.Said@cern.ch}{Emmanuel Said}.
\paragraph{System Description and Purpose}
The channel repeater is a device able to translate TTL and non-TTL signals
into 30V output pulses and regenerate 30V pulses. There are two kinds of
repetitors: 8 channel and 16 channel. The difference between them relies in the
number of channels as well as the rear connectors used in each of the
repeaters.
The aim of this document is setting the specifications needed for the renovation
of these devices due to the difficulties faced when it comes to maintenance and
repairing.

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\section{Functional Specifications}

As the circuit to be redone has shown proven reliability among its lifetime and
ease of use for the operator, the functional specifications gear towards these
two ideas.

\begin{description}
  \item \textbf{Main functionality}\\
  The circuit must convert TTL pulses and negative TTL to a 30V pulsed output.
  30V input pulses must be regenerated. The flat-top time of the pulse will be
  set to 1.2 $\mu$s. A more detailed information about pulse characteristics
  will be explained in the \textit{Technical Specification} section.
  \item \textbf{PCB Form Factor}\\
  The expected PCB Form Factor for each of the blocking oscillator should be a
  one or two-layered board with dimensions around 2 inches by 1 inch. Later
  fitting will be carried out for improving PCB panel explotation, according to
  IPC-2221A standard.
  \item \textbf{Working temperature range}\\
  Currently, the blocking oscillator installed feedbacks temperature to the
  blocking oscillator via a PTC. Moreover, it is desirable adding
  temperature monitoring into the prospective \textit{Self-Monitorization Module}.
  \item \textbf{Expected working lifetime}\\
  Depending on the expected working lifetime, several components would be
  carefully selected so as to comply in a long-term basis with technical
  specifications --- i.e. 30V pulse lenght.
  \item \textbf{Cost}\\
  To be determined.
  \item \textbf{Rack Form Factor}\\
  The rack form factor will be 19'' U1 for the 8 channel repeater and 19'' U2 for the 16 channel repeater. A possible improvement could be
  modifying the 16 channel repeater to U1 --whether it is possible to
  fit the blocking oscillators PCB in a different fashion or not.
  \item \textbf{Front Rack Panel Interface}\\
  It will consist of a LED indicator for each channel letting the operator
  quickly know if pulses are crossing the repeater by, as the previous version
  does. The control of this LED indicator should come from the
  \textit{Self-Monitorization Module}.
  \item \textbf{Rear Rack Panel Interface}\\
  It will consist of two galvanic-isolated 50 $\Omega$ terminated outputs and
  two inputs both for each channel, as the previous version
  does. It is recommended to move from LEMO 00 to another connector with more
  suppliers such as SMA or SMC.
  \item  \textbf{Coaxial Cable compilancy}\\
  Currently, the interconnection among blocking repeaters is done thanks to a
  50 $\Omega$ Coaxial Cable. The CERN Code SCEM reference is 04.61.11.225.6. Its
  technical specification for transmission line analysys will be taken into account in the \textit{Technical Specification} section.
  \item \textbf{Self-Monitorization Module}\\
  A monitorizing board can be added to the set of the 8 or 16 blocking
  oscillators channels so as to provide increased realibility over the previous
  design. Thus, additional testing points should be added to the blocking
  oscillator circuit to carry out this improvement.\\
  Subsequently, an operator could read a log of events with detailed information
  of the pulses.
\end{description}
\pagebreak

\section{Technical Specificiations}
\pagebreak

\appendix
\section{Pulse Generator waveform}
The way of testing the Pulse Generator waveform was done as follows:
\begin{enumerate}
  \item \textbf{Pulse Generator configuration}\\
  The pulse generator was configured
  in auto mode. The selected output was 30V and the frecuency of the pulse was
  set to 2K - 20K pps. The LEMO output was used as a source for the
  oscilloscope. A LEMO both-sided-ended cable of 10 ns was employed.
  \item  \textbf{Oscilloscope  configuration}\\
  The oscilloscope corresponds to the Tektronics TPS 2024. For avoiding the
  attenuation of the high frequencies in an eventual pulse overdamping, a
  10X probe configuration was set.
  \item  \textbf{Waveform measurements}\\
    \\
    \begin{tabular}{|l|r|}
    \hline
    t$_{rise}$ \hspace{0.2cm} 10\% - 90\% & 32 ns \\
    \hline
    Flat-top voltage & 30V \\
    \hline
    Overdamping & 9V \\
    time over 10\% of flat-top voltage & 46.80 ns \\
    \hline
    Time on high & 1.29 ns \\
    \hline
    Tilt --includes overdamping & 3V \\
    \hline
    t$_{fall}$ \hspace{0.2cm}90\% - 10\% & 550 ns \\
    \hline          
    \end{tabular}
\end{enumerate}
\end{document}
