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带控制输入的缓冲器的电路原理图符号

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带控制输入的缓冲器的电路原理图符号

circuitikz有一种op amp组件类型有两个输入、输出和up端口down，通常用于电源轨。还有一种buffer组件类型（我认为是它tikz自己提供的，而不是circuitikz库提供的），它有一个输入和一个输出，没有垂直端口。

我正在寻找一个具有一个输入、一个输出和垂直端口的缓冲器/放大器，用作控制引脚。我的用例是跟踪保持（又称采样保持）放大器符号，但三态缓冲器也很常见，并且需要控制输入。

SHA 示例电路

好的，该图使用了双输入 SHA。但我相信您可以想象单输入版本应该是什么样子（基本上，我试图制作一个隐藏所有复杂性的单个符号，用于高级框图）。

三态缓冲器符号

它的扩展库是否tikz提供了这样的功能？如果没有，我该如何正确地将垂直线与缓冲区的边缘对齐？

答案1

声明新的节点形状有点麻烦，但你会习惯的。以下是两个新的电路形状tri state buffer active low和tri state buffer active high，它们的行为类似于buffer gate和not gate，但提供了新的锚点control。这允许你绘制如下：

使用这个：

\begin{tikzpicture}[circuit logic US, on grid]
\node (i) {x};
\node (buf) [right of=i, tri state buffer active high] {};
\node (ctrl) [above=of buf] {c};
\node (o) [right of=buf] {y};

\draw (i) -- (buf.input)
    (ctrl) -- (buf.control)
    (buf.output) -- (o);
\end{tikzpicture}%

\begin{tikzpicture}[circuit logic US, on grid]
\node (i) {x};
\node (buf) [right of=i, tri state buffer active low] {};
\node (ctrl) [above=1 of buf] {c};
\node (o) [right of=buf] {y};

\draw (i) -- (buf.input)
    (ctrl) -- (buf.control)
    (buf.output) -- (o);
\end{tikzpicture}%

完整代码：

\documentclass[border=5mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning, circuits.logic.US}

\makeatletter%
%
%
\pgfdeclareshape{tri state buffer active high}{
    \inheritsavedanchors[from=buffer gate US]
    \inheritanchorborder[from=buffer gate US]
    \inheritanchor[from=buffer gate US]{center}
    \inheritanchor[from=buffer gate US]{base}
    \inheritanchor[from=buffer gate US]{base west}
    \inheritanchor[from=buffer gate US]{base east}
    \inheritanchor[from=buffer gate US]{mid}
    \inheritanchor[from=buffer gate US]{mid west}
    \inheritanchor[from=buffer gate US]{mid east}
    \inheritanchor[from=buffer gate US]{north}
    \inheritanchor[from=buffer gate US]{north west}
    \inheritanchor[from=buffer gate US]{north east} 
    \inheritanchor[from=buffer gate US]{south}
    \inheritanchor[from=buffer gate US]{south east}
    \inheritanchor[from=buffer gate US]{south west}
    \inheritanchor[from=buffer gate US]{west}
    \inheritanchor[from=buffer gate US]{east}
    \inheritanchor[from=buffer gate US]{input}
    \inheritanchor[from=buffer gate US]{output}
    \anchor{control}{%
        \dimensions
        \pgfpointintersectionoflines{\csname pgf@anchor@buffer gate US@north west\endcsname}{\tipanchor}{\centerpoint}{\centerpoint\advance\pgf@y1pt}%
    }%
    \backgroundpath{%
        \dimensions%
        \pgf@xc\halfwidth%
        \pgf@yc\halfheight%
        \advance\pgf@xc-\outerxsep%
        \advance\pgf@yc-\outerysep%
        {%
            \pgftransformshift{\centerpoint}%
            \pgfpathmoveto{\tipanchor}%
            \pgfpathlineto{\pgfqpoint{-.833333\pgf@xc}{1.166666\pgf@yc}}%
            \pgfpathlineto{\pgfqpoint{-.833333\pgf@xc}{-1.166666\pgf@yc}}%
            \pgfpathclose%
            %
            % Draw the input.
            %
            \expandafter\ifx\expandafter\pgf@lib@sh@itext\csname input-1\endcsname%
                {%
                    \pgfpathcircle{%
                        \pgf@xa\halfside%
                        \[email protected]\pgf@xa%
                        \advance\[email protected]\pgflinewidth%
                        \advance\pgf@x-\invertedradius%
                        \pgf@y0pt%
                    }{+\invertedradius}%                
                }%
            \fi%                
        }%
    }%
}

\pgfdeclareshape{tri state buffer active low}{
    \inheritsavedanchors[from=buffer gate US]
    \inheritanchorborder[from=buffer gate US]
    \inheritanchor[from=buffer gate US]{center}
    \inheritanchor[from=buffer gate US]{base}
    \inheritanchor[from=buffer gate US]{base west}
    \inheritanchor[from=buffer gate US]{base east}
    \inheritanchor[from=buffer gate US]{mid}
    \inheritanchor[from=buffer gate US]{mid west}
    \inheritanchor[from=buffer gate US]{mid east}
    \inheritanchor[from=buffer gate US]{north}
    \inheritanchor[from=buffer gate US]{north west}
    \inheritanchor[from=buffer gate US]{north east} 
    \inheritanchor[from=buffer gate US]{south}
    \inheritanchor[from=buffer gate US]{south east}
    \inheritanchor[from=buffer gate US]{south west}
    \inheritanchor[from=buffer gate US]{west}
    \inheritanchor[from=buffer gate US]{east}
    \inheritanchor[from=buffer gate US]{input}
    \inheritanchor[from=buffer gate US]{output}
    \anchor{control}{%
        \dimensions
        \tipanchor%
        \pgf@xa\pgf@x%  
        \pgf@ya\pgf@y%
        \csname pgf@anchor@buffer gate US@north west\endcsname%
        \advance\pgf@xa-\pgf@x%
        \advance\pgf@ya-\pgf@y%
        \pgfpointintersectionoflines{\csname pgf@anchor@buffer gate US@north west\endcsname}{\tipanchor}{\centerpoint}{\centerpoint\advance\pgf@y2pt}%
        \pgfmathparse{sqrt(\pgf@xa^2+\pgf@ya^2)/\pgf@xa*\invertedradius}
        \advance\pgf@y\pgfmathresult pt
        \advance\pgf@y\invertedradius
    }%
    \backgroundpath{%
        \dimensions%
        \pgf@xc\halfwidth%
        \pgf@yc\halfheight%
        \advance\pgf@xc-\outerxsep%
        \advance\pgf@yc-\outerysep%
        {%
            \pgftransformshift{\centerpoint}%
            \pgfpathmoveto{\tipanchor}%
            \pgfpathlineto{\pgfqpoint{-.833333\pgf@xc}{1.166666\pgf@yc}}%
            \pgfpathlineto{\pgfqpoint{-.833333\pgf@xc}{-1.166666\pgf@yc}}%
            \pgfpathclose%
            %
            % Draw the input.
            %
            \pgfpathcircle{%
                \tipanchor%
                \pgf@xa\pgf@x%  
                \pgf@ya\pgf@y%
                \csname pgf@anchor@buffer gate US@north west\endcsname%
                \advance\pgf@xa-\pgf@x%
                \advance\pgf@ya-\pgf@y%
                \pgfpointintersectionoflines{\csname pgf@anchor@buffer gate US@north west\endcsname}{\tipanchor}{\centerpoint}{\centerpoint\advance\pgf@y1pt}%
                \pgfmathparse{sqrt(\pgf@xa^2+\pgf@ya^2)/\pgf@xa*\invertedradius}
        \advance\pgf@y\pgfmathresult pt
                }{+\invertedradius}%
            \expandafter\ifx\expandafter\pgf@lib@sh@itext\csname input-1\endcsname%
                {%
                    \pgfpathcircle{%
                        \pgf@xa\halfside%
                        \[email protected]\pgf@xa%
                        \advance\[email protected]\pgflinewidth%
                        \advance\pgf@x-\invertedradius%
                        \pgf@y0pt%
                    }{+\invertedradius}%                
                }%
            \fi%                
        }%
    }%
}

\tikzset{
    circuit declare symbol=tri state buffer active low,
    set tri state buffer active low graphic={draw, shape=tri state buffer active low, minimum size=5mm},
    circuit declare symbol=tri state buffer active high,
    set tri state buffer active high graphic={draw,shape=tri state buffer active high,minimum size=5mm}
}

\begin{document}

%
\begin{tikzpicture}[circuit logic US, on grid]
\node (i) {x};
\node (buf) [right of=i, tri state buffer active high] {};
\node (ctrl) [above=of buf] {c};
\node (o) [right of=buf] {y};

\draw (i) -- (buf.input)
    (ctrl) -- (buf.control)
    (buf.output) -- (o);
\end{tikzpicture}%

\begin{tikzpicture}[circuit logic US, on grid]
\node (i) {x};
\node (buf) [right of=i, tri state buffer active low] {};
\node (ctrl) [above=1 of buf] {c};
\node (o) [right of=buf] {y};

\draw (i) -- (buf.input)
    (ctrl) -- (buf.control)
    (buf.output) -- (o);
\end{tikzpicture}%
\end{document}

答案2

如果您仅使用高电平有效三态缓冲器，这里有一个简单的解决方案：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes.gates.logic.US}
\begin{document}

\begin{tikzpicture}
\node (A) at (0,0) {$A$};
\node (E) at (0,0.5) {$E$};
\node (Y) at (2,0) {$Y$};
\node[buffer gate US, draw, logic gate inputs=n] at (1,0) (TS) {};
\draw (A) -- (TS.input);
\draw (E) -| (TS.north);
\draw (TS.output) -- (Y);
\end{tikzpicture}

\end{document}

在此处输入图片描述

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