[Tex/LaTex] Boolean AND Gate

Question

I cannot figure out how I can to draw and label a single AND gate. All of the online examples are horizontally aligned. I drew the image. Please anyone show me how do this in LaTeX.

Edited to clarify: Also, I want to label the wires in 3 places each as I show in the image.

Answer 1

Following Mythio's suggestion, you can use "pure" TikZ code to locate the labels.

Here is how it works:

• draw the AND port and remember to give it a name because in such a way later on you can access the inputs and output pins; for example:

  \draw (0,0) node[rotate=90,and port] () {};

• the blue circle represents the exact coordinates of the inputs and output pin: this means that to locate the labels a,b,c you need to shift a bit that positions:

  % labels a, b, c
  \node[right=0.01cm,yshift=4pt] at (andp.in 1) {a};
  \node[right=0.01cm,yshift=4pt] at (andp.in 2) {b};
  \node[right=0.01cm,yshift=-4pt] at (andp.out) {c};
  

• always starting from that coordinates, the last step is to extend the wires in order to have space to locate the last labels representing the bits entering/exiting the port:

  % other labels
  \draw (andp.in 1) --++(0,-0.5) node[pos=0.65]{y0 y1};
  \draw (andp.in 2) --++(0,-0.5) node[right,pos=0.65]{z0 z1};
  \draw (andp.out) --++(0,0.5) node[right,pos=0.65]{x0 x1};
  

With the syntax --++(<x,y>) we are saying that the wire ends in a position that is the sum of the initial one plus <x,y> specified.

The whole code:

\documentclass[tikz,png,border=10pt]{standalone}
\usepackage{circuitikz}    

\begin{document}
\begin{circuitikz}[inner sep=0pt,font=\tiny,text height=3pt,text width=15pt]
\draw (0,0) node[rotate=90,and port] (andp) {};

% labels a, b, c
\node[right=0.01cm,yshift=4pt] at (andp.in 1) {a};
\node[right=0.01cm,yshift=4pt] at (andp.in 2) {b};
\node[right=0.01cm,yshift=-4pt] at (andp.out) {c};

% other labels
\draw (andp.in 1) --++(0,-0.5) node[pos=0.65]{y0 y1};
\draw (andp.in 2) --++(0,-0.5) node[right,pos=0.65]{z0 z1};
\draw (andp.out) --++(0,0.5) node[right,pos=0.65]{x0 x1};
\end{circuitikz}
\end{document}

and the result:

Some other options have been set in the code:

1. inner sep=0pt to let nodes do not occupy too much space (look in the pgfmanual for the exact use of this option);
2. font=\tiny sets the font size of the labels;
3. text height=3pt in this example allows labels a,b be vertical aligned on the same baseline;
4. text width=15pt is used in order to have automatically labels x0,x1 - y0,y1 - z0,z1 on new line (again, see on the pgfmanual how to use this option in general);
5. pos=0.65 represents the position of the labels within the extended wire.

---

To connect this port with extended wires to other logic ports, using coordinates is of help. To mark exactly the end position of the extended wires one could do:

\draw (andp.in 1) --++(0,-0.5) coordinate (a) node[pos=0.65]{y0 y1};
\draw (andp.in 2) --++(0,-0.5) coordinate (b) node[right,pos=0.65]{z0 z1};

and later on use (a) and (b) as reference.

An example:

\documentclass[tikz,png,border=10pt]{standalone}
\usepackage{circuitikz}    

\begin{document}
\begin{circuitikz}[inner sep=0pt,font=\tiny,text height=3pt,text width=15pt]
\draw 
 (1,2.5) node[rotate=90,and port] (andp) {}
 (2,0) node[rotate=90,and port] (andp1) {}
 (0,0) node[rotate=90,and port] (andp2) {};

% labels a, b, c
\node[right=0.01cm,yshift=4pt] at (andp.in 1) {a};
\node[right=0.01cm,yshift=4pt] at (andp.in 2) {b};
\node[right=0.01cm,yshift=-4pt] at (andp.out) {c};

% other labels
\draw (andp.in 1) --++(0,-0.5) coordinate (a) node[pos=0.65]{y0 y1};
\draw (andp.in 2) --++(0,-0.5) coordinate (b) node[right,pos=0.65]{z0 z1};
\draw (andp.out) --++(0,0.5) node[right,pos=0.65]{x0 x1};

% connections
\draw (andp1.out)-|(b)
 (andp2.out)-|(a);

\end{circuitikz}
\end{document}

The result: