Circuitikz 错位 cir

Question

我正在尝试绘制高通滤波器，但电容输入很奇怪。这是为什么？

\begin{circuitikz}
            \draw (0,0) node[op amp] (opamp) {}
            (opamp.-) to [R=$R_1$] ($(opamp.-)-(2,0)$) 
            to[C=$C_1$, *-o] (-4,0)
            (opamp.-) |- ($(opamp.-)+(0.2,1)$) to[R=$R_2$] ($(opamp.-)+(2.2,1)$) -|
            (opamp.out) to[short,*-] ($(opamp.out)+(.5,0)$) node [right] {$V_{out}$} node [ocirc] {} 
            (opamp.+) to[short]  ($(opamp.+)-(0,.5)$) node[ground] {}
            ;
        \end{circuitikz}

生产

Answer 1

使用相对定位：

\documentclass[margin=3mm]{standalone}
\usepackage{circuitikz}

\begin{document}
    \begin{circuitikz}
\draw   (0,0)       node[op amp] (opamp) {}
        (opamp.-)   to [R=$R_1$] ++ (-2,0)
                    to [C=$C_1$, *-o] ++(-2,0)
        (opamp.-)   to [short,*-] ++ (0,1) coordinate (aux)
                    to [R=$R_2$] (aux-|opamp.out) 
                    -- (opamp.out)
        (opamp.out) to [short,*-o] ++ (.5,0)  node [right] {$V_{out}$}
        (opamp.+)   to [short]     ++ (0,-.5) node[ground] {};
    \end{circuitikz}
\end{document}