Drawing circuit diagrams (with logic gates) in LaTeX

Question

I'm having some difficult drawing circuit diagrams with logic gates in LaTeX. I've tried with circuitikz and pst-circ.

\begin{pspicture}(-1,-1)(5,3)
\logicand[ninputs=2,invertinputa=true, invertinputb=true](0,0){Name}
\end{pspicture}

gives

Error: ! Undefined control sequence.
<recently read> \c@lor@to@ps 

l.75 ...inputa=true, invertinputb=true](0,0){Name}

? 

And

\begin{circuitikz} \draw
(0,2) node[and port] (myand1) {}
(0,0) node[and port] (myand2) {}
(2,1) node[xnor port] (myxnor) {};
(myand1.out) | (myxnor.in 1)
(myand2.out) | (myxnor.in 2)
\end{circuitikz}

produces no error, but also no lines appear between logic gates.

Please help me generate logic diagrams from LaTeX code. (I need AND, OR, NOT, NOR and NAND gates.)

Answer 1

For the circuitikz approach: You need to tell TikZ what to do with (myand1.out), (myxnor.in 1), and so on. At the moment, you just mention the nodes, but don't tell TikZ to actually connect them, because you ended the previous \draw command already with the ;. Also, to connect nodes with straight lines, you need to use --, not |.

Here's your example in a full MWE.

\documentclass{article}
\usepackage{circuitikz}
\begin{document}

\begin{circuitikz} \draw
(0,2) node[and port] (myand1) {}
(0,0) node[and port] (myand2) {}
(2,1) node[xnor port] (myxnor) {}
(myand1.out) -- (myxnor.in 1)
(myand2.out) -- (myxnor.in 2);
\end{circuitikz}

\end{document}

Answer 2

I've never used circuitikz but shapes.gates.logic tikzlibrary. You have AND, NOT, NOR and all logic gates, place them as regular tikz nodes and draw connections. That's all. Here you have an example:

\documentclass[border=3mm]{standalone}

\usepackage{tikz}
\usetikzlibrary{arrows,shapes.gates.logic.US,shapes.gates.logic.IEC,calc}
\begin{document}
\thispagestyle{empty}
\tikzstyle{branch}=[fill,shape=circle,minimum size=3pt,inner sep=0pt]
\begin{tikzpicture}[label distance=2mm]

    \node (x3) at (0,0) {$x_3$};
    \node (x2) at (1,0) {$x_2$};
    \node (x1) at (2,0) {$x_1$};
    \node (x0) at (3,0) {$x_0$};

    \node[not gate US, draw, rotate=-90] at ($(x2)+(0.5,-1)$) (Not2) {};
    \node[not gate US, draw, rotate=-90] at ($(x1)+(0.5,-1)$) (Not1) {};
    \node[not gate US, draw, rotate=-90] at ($(x0)+(0.5,-1)$) (Not0) {};

    \node[or gate US, draw, logic gate inputs=nnn] at ($(x0)+(2,-2)$) (Or1) {};
    \node[or gate US, draw, logic gate inputs=nnnn] at ($(Or1)+(0,-1)$) (Or2) {};
    \node[or gate US, draw, logic gate inputs=nnn] at ($(Or2)+(0,-1)$) (Or3) {};
    \node[xor gate US, draw, logic gate inputs=nn] at ($(Or3)+(0,-1)$) (Xor1) {};
    \node[and gate US, draw, logic gate inputs=nn, anchor=input 1] at ($(Or3.output)+(1,0)$) (And1) {};
    \node[nor gate US, draw, logic gate inputs=nn, anchor=input 1] at ($(Or2.output -| And1.output)+(1,0)$) (Nor1) {};
    \node[and gate US, draw, logic gate inputs=nn, anchor=input 1] at ($(Or1.output -| Nor1.output)+(1,0)$) (And2) {};

    \foreach \i in {2,1,0}
    {
        \path (x\i) -- coordinate (punt\i) (x\i |- Not\i.input);
        \draw (punt\i) node[branch] {} -| (Not\i.input);
    }
    \draw (x3) |- (Or2.input 1);
    \draw (x3 |- Or1.input 1) node[branch] {} -- (Or1.input 1);
    \draw (x2) |- (Xor1.input 1);
    \draw (x2 |- Or3.input 1) node[branch] {} -- (Or3.input 1);
    \draw (Not2.output) |- (Or2.input 2);
    \draw (x1) |- (Or3.input 2);
    \draw (x1 |- Or1.input 2) node[branch] {} -- (Or1.input 2);
    \draw (Not1.output) |- (Xor1.input 2);
    \draw (Not1.output |- Or2.input 3) node[branch] {} -- (Or2.input 3);
    \draw (x0) |- (Or2.input 4);
    \draw (Not0.output) |- (Or3.input 3);
    \draw (Not0.output |- Or1.input 3) node[branch] {} -- (Or1.input 3);
    \draw (Or3.output) -- (And1.input 1);
    \draw (Xor1.output) -- ([xshift=0.5cm]Xor1.output) |- (And1.input 2);
    \draw (Or2.output) -- (Nor1.input 1);
    \draw (And1.output) -- ([xshift=0.5cm]And1.output) |- (Nor1.input 2);
    \draw (Or1.output) -- (And2.input 1);
    \draw (Nor1.output) -- ([xshift=0.5cm]Nor1.output) |- (And2.input 2);
    \draw (And2.output) -- ([xshift=0.5cm]And2.output) node[above] {$f_1$};

\end{tikzpicture}
\end{document} 

Answer 3

I'm not entirely sure what you're after; here is an example taken directly from the documentation, which you can find by running

texdoc pst-circ

When using PSTricks if you use

latex myfile.tex
dvips myfile.dvi
ps2pdf myfile.ps

then the following file will work

\documentclass{article}

\usepackage{pst-circ}

\begin{document}

\begin{pspicture}(-4,0)(5,7)
\psset{logicWidth=1, logicHeight=2, dotsize=0.15}
\logic[logicWireLength=0](-2,0){A0}
\logic[logicWireLength=0](-2,5){A1}
\ncbar[angleA=-180,angleB=-180,arm=0.5]{A11}{A02}
\psline[dotsize=0.15]{-*}(-3.5,3.5)(-2.5,3.5)
\uput[180](-3.5,3.5){$T$}
\psline(-3.5,0.5)(A01)\uput[180](-3.5,0.5){$S$}
\psline(-3.5,6.5)(A12)\uput[180](-3.5,6.5){$R$}
\psset{logicType=nor, logicLabelstyle=\normalsize}
\logic(1,0.5){nor1}
\logic(1,4.5){nor2}
\psline(nor2Q)(4,0|nor2Q)
\uput[0](4,0|nor2Q){$Q$}
\psline(nor1Q)(4,0|nor1Q)
\uput[0](4,0|nor1Q){$\overline{Q}$}
\psline{*-}(3,0|nor2Q)(3,4)(1,4)(0,3)(0,0|nor12)(nor12)
\psline{*-}(3,0|nor1Q)(3,3)(1,3)(0,4)(0,0|nor21)(nor21)
\psline(A0Q)(nor11)
\psline(A1Q)(nor22)
\end{pspicture}

\end{document}

If you would prefer to use pdflatex then your preamble should look like

\documentclass{article}

\usepackage[pdf]{pstricks}
\usepackage{pst-circ}

\begin{document}
...

and then you can run

pdflatex -shell-escape myfile.tex

Answer 4

Try this generator will work for simple cases and it uses Tikz

for your case latex code will be like this:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric, arrows}
\begin{document}
\usetikzlibrary {circuits.logic.US}
\begin{tikzpicture}[circuit logic US]
\matrix[column sep=4mm, row sep=4mm] {
\node [and gate ] (f5fbb9ac-ba33-4ab5-96bc-d0af34cee8a1) {}; & & \ 
& & \node [xnor gate ] (a6b7442d-0f66-4798-9db4-25a81365166e) {}; \ 
\node [and gate ] (ca150480-f272-4220-9df1-14d5893b1ae2) {}; & & \ 
};
\draw (f5fbb9ac-ba33-4ab5-96bc-d0af34cee8a1.output) -- ++(right:2mm) |- (a6b7442d-0f66-4798-9db4-25a81365166e.input 1);
\draw (ca150480-f272-4220-9df1-14d5893b1ae2.output) -- ++(right:2mm) |- (a6b7442d-0f66-4798-9db4-25a81365166e.input 2);
\end{tikzpicture}
\end{document}