Help in this transistor level ciruit

Question

I'm working in this circuit:

Here what I have done:

\documentclass[11pt]{article}

\usepackage[english]{babel}
\usepackage{circuitikz}
\usepackage{tikz}
\begin{document}

\begin{center}
\begin{circuitikz}[american voltages, european resistors]
\ctikzset { label/align = straight }
\draw (0,0) 
node[nmos](nmosA){}node[left=10mm] {$\overline{A}$} (2,0)
node[nmos](nmosB){}node[left=10mm] {B}
(nmosA.D) to (nmosB.D)
to [short,*-o] ++(1,0) {} node[right=2mm] {Y}
(1,-1.54) node[nmos](nmosC){}node[left=10mm] {C}
(nmosA.S) to (nmosC.D) to (nmosB.S);
%(nmosC.S) to node[ground]{};
\end{circuitikz}
\end{center}
\end{document}

I'd like to know how to connect the ground (the way I tried is wrong), how to put circles in the opened terminals of the transistors and maybe how to improve the draw since I put some weird coordinates (1,-1.54) node[nmos](nmosC){}node[left=10mm]. If someone has a similar example would be of great value. Regards.

Answer 1

Here's how I would do it. Instead of manually adjusting the position of the labels, use the anchors of the transistors and position the label nodes left or right of these. to paths leading nowhere (++(0,0)) can be used to add filled or open marks at the transistor anchors.

I also avoided manually positioning the transistor "C" by using the calc library to compute the midpoint and anchoring the final transistor by its drain.

\documentclass[tikz]{standalone}
\usepackage{circuitikz}
\usetikzlibrary{calc}
\ctikzset { label/align = straight }

\begin{document}
\begin{circuitikz}[american voltages, european resistors]
\draw (0,0) 
  node[nmos] (nmosA) {}
  (nmosA.G) to[short,-o] ++(0,0) node[left] {$\overline{A}$} (2,0)
  node[nmos] (nmosB) {}
  (nmosB.G) to[short,-o] ++(0,0) node[left] {B}
  (nmosA.D) to (nmosB.D)
  to [short,*-o] ++(1,0) {} node[right] {Y}
  (nmosA.S) to[short] (nmosB.S)
  ($(nmosA.S)!0.5!(nmosB.S)$) to[short,-*] ++(0,0) node[nmos,anchor=D] (nmosC) {}
  (nmosC.G) to[short,-o] ++(0,0) node[left] {C}
  (nmosC.S) node[ground] {};
\end{circuitikz}
\end{document}