\documentclass{standalone}
\usepackage[american]{circuitikz}
\usepackage{graphicx}
\usepackage{mathrsfs} 
\usepackage{latexsym,amssymb,amsmath}
\newcommand{\equal}{=}
\begin{document}
		\begin{circuitikz}
		%\draw (0,4) to [open,v^>=$v_1(t)$,o-o]  (0,0) -- Open Short
		\draw (0,6) to [open,l=$e_i$,o-o]  (0,1) % input
			(0,6) to  [C, l^= $C$,-*] (2,6)	%C
			(2,6) to  [R, l^=$R_1$,-*] (2,1)	%R1
			(2,1) -- (2,0.5) node[ground]{}	%ground
			(5, 5.5) node[op amp,yscale=-1] (opamp) {}
			(2,	6) to [open, -*] (3.5,6) node[above]{$A$}
			(2,6) -- (opamp.+) 
		     (3.5,5) node[left]{$B$} to [short,*-] 	(opamp.-)
		     (opamp.out)  to [short,-*]  (6.5,5.5)
		     to [R, l_=$R_2$,-*] (6.5,3) %R2
		     to [R, l_=$R_3$, -*] (6.5,1)
		     (6.5,3) -- (3.5,3)	% connect B to middle of resistors
		     (3.5,3) -- (3.5,5)	% vertical connection to B
			(6.5,5.5) -- (7.5,5.5)
			(7.5,5.5) to [open,l_=$e_o$,o-o]  (7.5,1) % output
			(0,1) -- (7.5,1) % wire
			;
	\end{circuitikz}
\end{document}