circuitikzを用いた回路図作成
回路図を書くソフトを色々探したが、結局latexで図を描画するパッケージであるtikzのcircuitikzライブラリを用いている。
\documentclass[border=1mm]{standalone} \usepackage[dvipdfmx]{graphicx} \usepackage{circuitikz} \usetikzlibrary{calc} \begin{document} \begin{circuitikz} \draw (0,0) node [op amp] (opamp1) {} (5,0) node [op amp] (opamp2) {} (10,0) node [op amp] (opamp3) {} (opamp1.-) to[R,-o,label=$R_3$] ++(-2,0) coordinate (V1) {} (V1) node[left] {$V_1$} (opamp1.out) to[R,label=$R_4$] ($(opamp2.-)!(opamp1.out)!(opamp2.+)$) -| (opamp2.-) (opamp2.out) to[R,label=$R_5$] ($(opamp3.-)!(opamp2.out)!(opamp3.+)$) -| (opamp3.-) (opamp3.out) to[short,-o] ++(1,0) coordinate (V2) {} (V2) node[right] {$V_2$} (opamp1.+) -- ++(0,-1) node[ground] {} (opamp2.+) -- ++(0,-1) node[ground] {} (opamp3.+) -- ++(0,-1) node[ground] {} (opamp1.-) ++(0,4) coordinate (p1) {} (p1) ++ (10,0) coordinate (p1') {} ($(p1)!(opamp3.out)!(p1')$) coordinate (p2) {} (opamp1.-) to[short,*-] (p1) to[R,label=$R_2$] (p2) to[short,-*] (opamp3.out) (opamp1.-) ++(0,1.5) coordinate (p3) {} (p3) ++ (5,0) coordinate(p3') {} ($(p3)!(opamp1.out)!(p3')$) coordinate (p4) {} (p3) to[C,*-*,label=$C_1$] (p4) to[short,*-*] (opamp1.out) (opamp1.-) ++(0,3) coordinate (p5) {} (p5) ++ (5,0) coordinate(p5') {} ($(p5)!(opamp1.out)!(p5')$) coordinate (p6) {} (p5) to[R,*-,label=$R_1$] (p6) -- (p4) (opamp2.-) ++(0,1.5) coordinate (p7) {} (p7) ++ (5,0) coordinate (p7') {} ($(p7)!(opamp2.out)!(p7')$) coordinate (p8) {} (opamp2.-) to[short,*-] (p7) to[C,label=$C_2$] (p8) to[short,-*] (opamp2.out) (opamp3.-) ++(0,1.5) coordinate (p9) {} (p9) ++ (5,0) coordinate (p9') {} ($(p9)!(opamp3.out)!(p9')$) coordinate (p10) {} (opamp3.-) to[short,*-] (p9) to[R,-*,label=$R_5$] (p10) ; \end{circuitikz} \end{document}