Radiofrequency Frontend

This is an example of a block diagram of a radiofrequency front-end (RF-FE).

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\documentclass[border=10pt]{standalone}  
\usepackage{tikz}
\usepackage{pgfplots} % loads tikz which loads pgf
\usepackage[american,siunitx]{circuitikz}
\usetikzlibrary{arrows,calc,positioning,fit}
\pgfplotsset{
  compat=1.15,
  within block/.style={
    scale only axis,
    scale=0.423,
    anchor=center,
    axis x line=middle,
    axis y line=none,
    enlargelimits=0.1,
    width=2cm,
    height=15mm,
    xtick=\empty,
    ytick=\empty,
    domain=0:85,
    samples=15,
    tickwidth=0,
    clip mode=individual,
    every axis plot/.append style={
        smooth,
        mark options={
            draw=black,
            fill=black,
            mark size=1pt
        }
    },
    before end axis/.code={
        \node [draw,thick, shape=circle, inner sep=-2pt,
          fit=(current axis), label={below:{NCO}}] (nco) {};
        }
    }
}
\newcommand{\mixer}[2]
{  % #1 = reference coordinate, #2 = name
  \node[draw, thick, shape=circle, minimum size=24pt, at={#1}](#2){};
  \draw[rotate=45,line width=0.5pt] (#2.center)+(0,-12pt) -- +(0,12pt);
 
 
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