latex 画流程图

%画流程图
documentclass[UTF8]{ctexart}
usepackage{tikz,mathpazo}
usetikzlibrary{shapes.geometric, arrows}
usepackage{flowchart}
begin{document}
begin{tikzpicture}[font={sf small}]
def smbwd{2cm}
thispagestyle{empty}
%定义每一步的具体形状
node (input) at (0,5) [draw, terminal, minimum width=3cm, minimum height=0.8cm] {信号输入}; %predproc decision storage process
node (LO) at (-5,4) [draw, terminal, minimum width=smbwd, minimum height=1cm] {本振};
node (FM) at (-3,1.5) [draw, terminal, minimum width=smbwd, minimum height=1cm] {倍频};
node (mixer) at (0,-2) [draw,terminal, minimum width=smbwd, minimum height=1cm] {杜瓦混频器};
node (n) at (0,-3) [draw,terminal,minimum width=0cm,minimum height=0cm]{};
node (IF1) at (-5,-5) [draw,terminal, minimum width=smbwd, minimum height=1cm] {中频1};
node (IF2) at (5,-5) [draw, terminal, minimum width=smbwd, minimum height=1cm] {中频2};
node (FFTS1) at (-5,-8) [draw,terminal, minimum width=smbwd, minimum height=1cm] {FFTS1};
node (FFTS2) at (5,-8) [draw, terminal, minimum width=smbwd, minimum height=1cm] {FFTS2};
%node (storage) at (0,-5.5) [draw, storage, minimum width=smbwd, minimum height=1cm] {数据存储}; %定义数据存储
%node (process) at (3,-5.5) [draw, process, minimum width=smbwd, minimum height=1cm] {处理过程}; %定义处理过程
%coordinate (point1) at (0,-6.75);
%node (end) at (0,-7.75) [draw, terminal,minimum width=smbwd,minimum height=0.5cm] {结束}; %定义结束
%连接定义的形状，绘制流程图--表示垂直线，|表示箭头方向
draw[->] (input) -- (mixer);
draw[->] (LO) -- (FM);
%draw[->] (FM) -- (mixer);
draw [color=blue!50,->](-3,1.5) node[left]{$A$}-- node [color=red!70,pos=0.25,above,sloped]{本振}(0,-2) node[right]{$B$};
draw[->] (mixer) -- (n);
draw[->] (n) -| (IF1);
draw[->] (n) -| (IF2);
draw[->] (IF1) -- (FFTS1);
draw[->] (IF2) -- (FFTS2);
%draw[->] (decide) -| node[above]{是} (process);
%draw[->] (decide) -- node[above]{否}(storage);
%draw[->] (process) |- (point1);
%draw[->] (storage) -- (point1) -- (end);
end{tikzpicture}
end{document}

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