See also sides Cascade form "\\usepackage{tikz}\n\\usetikzlibrary{positioning}\n\n\\begin{document}\n\\begin{tikzpicture}[auto, node distance=1.8cm, >=latex]\n\n% Part (a) - Series Block Diagram\n\\node at (2, 1.5) {\\textit{(a)}};\n\n% Nodes for first block diagram\n\\node[] (R) {$R(s)$};\n\\node[draw, rectangle, right=1.5cm of R, minimum width=1.5cm, minimum height=1cm] (G1) {$G_1(s)$};\n\\node[draw, rectangle, right=1.5cm of G1, minimum width=1.5cm, minimum height=1cm] (G2) {$G_2(s)$};\n\\node[draw, rectangle, right=1.5cm of G2, minimum width=1.5cm, minimum height=1cm] (G3) {$G_3(s)$};\n\\node[right=1.5cm of G3] (C) {$C(s)$};\n\n% Arrows for first block diagram\n\\draw[->] (R) -- (G1);\n\\draw[->] (G1) -- (G2);\n\\draw[->] (G2) -- (G3);\n\\draw[->] (G3) -- (C);\n\n% Part (b) - Simplified Block Diagram\n\\node at (2, -1.5) {\\textit{(b)}};\n\n% Nodes for simplified block diagram\n\\node[] (R2) at (0, -3) {$R(s)$};\n\\node[draw, rectangle, right=3.5cm of R2, minimum width=3.5cm, minimum height=1cm] (G123) {$G_3(s)G_2(s)G_1(s)$};\n\\node[right=2cm of G123] (C2) {$C(s)$};\n\n% Arrows for simplified block diagram\n\\draw[->] (R2) -- (G123);\n\\draw[->] (G123) -- (C2);\n\n\\end{tikzpicture}\n\\end{document}"(a)R(s)G1(s)G2(s)G3(s)C(s)(b)R(s)G3(s)G2(s)G1(s)C(s) source code Parallel form "\\usepackage{tikz}\n\\usetikzlibrary{positioning, arrows.meta}\n\n\\begin{document}\n\\begin{tikzpicture}[auto, node distance=1.5cm, >=Latex]\n\n% -------------------- PART (a) --------------------\n\\node at (1.5, 1.5) {\\textit{(a)}};\n\n% Input node\n\\node (R) at (1.5, -1.5) {$R(s)$};\n\n% Blocks G1, G2, G3\n\\node[draw, rectangle, minimum width=1.5cm, minimum height=1cm, right=1.5cm of R, yshift=1.5cm] (G1) {$G_1(s)$};\n\\node[draw, rectangle, minimum width=1.5cm, minimum height=1cm, right=1.5cm of R] (G2) {$G_2(s)$};\n\\node[draw, rectangle, minimum width=1.5cm, minimum height=1cm, right=1.5cm of R, yshift=-1.5cm] (G3) {$G_3(s)$};\n\n% Summing point\n\\node[draw, circle, minimum size=0.5cm, right=4.5cm of R] (sum) {\\Large $\\Sigma$};\n\n% Output node\n\\node[right=1.5cm of sum] (C) {$C(s)$};\n\n% Arrows from R to blocks\n\\draw[->] (R) -- (G1);\n\\draw[->] (R) -- (G2);\n\\draw[->] (R) -- (G3);\n\n% Arrows from blocks to summing point\n\\draw[->] (G1.east) -- ++(2,0) |- (sum.north);\n\\draw[->] (G2.east) -- ++(0.5,0) -- (sum.west);\n\\draw[->] (G3.east) -- ++(2,0) |- (sum.south);\n\n% Arrow from summing point to output\n\\draw[->] (sum.east) -- (C);\n\n% -------------------- PART (b) --------------------\n\\node at (1.5, -5) {\\textit{(b)}};\n\n% Simplified block diagram\n\\node[draw, rectangle, minimum width=3.5cm, minimum height=1cm, below=4cm of R] (simplified) {$\\pm G_1(s) \\pm G_2(s) \\pm G_3(s)$};\n\n% Input and output for simplified block\n\\node[left=1.5cm of simplified] (R2) {$R(s)$};\n\\node[right=1.5cm of simplified] (C2) {$C(s)$};\n\n% Arrows for simplified block\n\\draw[->] (R2) -- (simplified);\n\\draw[->] (simplified) -- (C2);\n\n\\end{tikzpicture}\n\\end{document}"(a)R(s)G1(s)G2(s)G3(s)§C(s)(b)§G1(s)§G2(s)§G3(s)R(s)C(s) source code Feedback loop Moving through summing junction Reduction via Familiar Forms
