%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-7-35 on page 442.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.83385pt}
\StartShownPreambleCommands
\usepackage{sfg}
\StopShownPreambleCommands
\begin{document}
\sfgsetunit{0.5cm} \sfgsetsize{0.12}{0.4}{0.5}{0.3} \sfgsetcompass
\begin{picture}(27,4)   % branches related to node 2
  \put(6,2){\sfgbranch{3}{0}\S{$\frac{1}{R_1}$}}
  \put(9,2){\sfgbranch{3}{0}\N{\boldmath $Z_2$}}
  \put(18,2){\sfgcurve{-9}{0}{2}\S{$\frac{1}{R_2}$}}
  \put(24,2){\sfgcurve{-15}{0}{-2}\N{$sC_1$}} % branches related to node 3
  \put(12,2){\sfgbranch{3}{0}\N{$\frac{1}{R_2}$}}
  \put(15,2){\sfgbranch{3}{0}\N{\boldmath $Z_3$}}
  \put(0,2){\sfgcurve{6}{0}{2}\N{$1$}}% input, voltage gain, output
  \put(18,2){\sfgcurve{6}{0}{-2}\S{$\alpha_{\mathrm{V}}$}}
  \put(24,2){\sfgbranch{3}{0}\S{$1$}}
  \put(0,2){\sfgtermnode\S{$V_{\mathrm{in}}$}}   % nodes
  \put(3,2){\sfgnode\S{$I_1$}}  \put(6,2){\sfgnode\S{$V_1$}}
  \put(9,2){\sfgnode\S{$I_2$}}  \put(12,2){\sfgnode\S{$V_2$}}
  \put(15,2){\sfgnode\S{$I_3$}} \put(18,2){\sfgnode\S{$V_3$}}
  \put(21,2){\sfgnode\S{$I_4$}} \put(24,2){\sfgnode\S{$V_4$}}
  \put(27,2){\sfgtermnode\S{$V_{\mathrm{out}}$}}
\end{picture}
\end{document}