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帮助使用 tikz 绘制电子系统

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帮助使用 tikz 绘制电子系统

我有这个代码：

% Title: Block diagram of Third order noise shaper in Compact Disc Players
% Author: Ramón Jaramillo
\documentclass[border=10pt]{standalone}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows}

\begin{document}
%Blocks
\tikzset{%
  block/.style    = {draw, thick, rectangle, minimum height = 3em,
    minimum width = 3em},
  circle/.style      = {draw, circle, node distance = 2cm},
}

%Symbols
\renewcommand{\sum}{\Large$+$}
\newcommand{\cross}{\Large$\times$}

\begin{tikzpicture}[auto, node distance=2cm, >=triangle 45]
%nodes
\node [] (start) at (0,0) {};
\node [circle, right of=start] (plus) {\cross};
\node at (7,0)[] (end) {};
\node at (6.8,0)[] (send) {};
\node [block, below of=send] (T) {T};
%##### I don't know how to place the last node - it should be in the midlle between plus and send and 2x the distance from send to T.
%arrows
\draw[->] (start) -- (plus);
\draw[->] (plus) -- (end);
\draw[--] (send) -- (T);
\end{tikzpicture}
\end{document}

最后看起来应该是这样的： Tikz示例

但是在节点（开始）的左侧应该有字母 a，在节点（结束）的右侧应该有字母 b，并且应该有一个短水平箭头显示在十字上（我无法画出）。

问题 它没有编译通过。我不知道如何做最后的注释。我不知道如何贴上标签。我不知道如何让箭头改变方向。

提前谢谢您！问候！

答案1

类似这样的事？

在此处输入图片描述

您的代码的主要问题是重新定义circlewhich 调用circle。我将其替换为my circle。对于元素，我使用了绝对定位，虽然不太优雅，但允许所有自由度。

\documentclass[border=10pt]{standalone}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows}

\begin{document}
%Blocks
\tikzset{%
  block/.style    = {draw, thick, rectangle, minimum height = 3em,
    minimum width = 3em},
  my circle/.style   = {draw, circle, node distance = 2cm},
}

%Symbols
\renewcommand{\sum}{\Large$+$}
\newcommand{\cross}{\Large$\times$}

\begin{tikzpicture}[auto, node distance=2cm, >=triangle 45]
\node (start) at (0,0) {a};
\node[my circle] (plus) at (2,0) {\sum};
\node[my circle] (times) at (4,-2) {\cross};
\node[block] at (6.5,-1) (T) {T};
\node (end) at (8,0) {b};
\coordinate (send) at (6.5,0);
\draw[->] (start) -- (plus);
\draw[->] (plus) -- (end);
\draw (send) -- (T);
\draw[->] (T) |- (times);
\draw[->] (times) -| (plus);
\end{tikzpicture}

\end{document}

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