PMOS Differential Pair

PMOS Differential Pair

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\begin{tikzpicture}
%--------start graphics code --------
%Define figure dimensions
\def\figHt{6};  
\def\figWd{7}; 
%Grid for intial drawing. 
%Comment next three lines once typesetting finished 
\draw[step=0.5,very thin, black!20] (-0.5,-0.5) grid (\figWd,\figHt);
\foreach \x in {0,...,\figWd} {\node [anchor=north] at (\x,-0.5) {\x};}
\foreach \y in {0,...,\figHt} {\node [anchor=east] at (-0.5,\y) {\y};}
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% PMOS current mirror %%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\coordinate (ref_node)  at (0,0);
\coordinate (ref_nodeT) at ($(ref_node)+(0,\figHt)$);
%Instantiation of components
\draw (ref_nodeT) node[pmos,anchor=source,xscale=-1](Mt0){}; 
\draw (Mt0.drain) to [I=$I_{ref}$] (ref_node);
%Inter-connections
\draw (Mt0.gate) |- (Mt0.drain) node[circ]{};
% Numbering the components
\draw (Mt0.base) node[left] {$M_{t0}$};
%Ground and Vdd lines
\draw (ref_node) node[ground]{};
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% Differential pair(PMOS input) %%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\coordinate (ref_node4) at (4,0); 
\path (ref_node4)    ++(0,\figHt)coordinate (ref_node4T);
\path (ref_node4)    ++(-1.5,0)  coordinate (ref_node4N);
\path (ref_node4N)   ++(3,0)     coordinate (ref_node4P);
%Instantiation of components
\draw (ref_node4T) node[pmos,anchor=source](M0){}
      (ref_node4T) ++(-1.5,-2) node[pmos,anchor=source](M1){}
      (ref_node4T) ++(1.5,-2)  node[pmos,anchor=source,xscale=-1](M2){}
      (ref_node4N) node[nmos,anchor=source,xscale=-1](M3){}
      (ref_node4P) node[nmos,anchor=source,xscale=1](M4){};
%Inter-connections
\draw (M0.drain) |- (M1.source) 
      --  ++(1.5,0) node[circ]{} -- (M2.source);  
\draw (M2.drain) -- (M4.drain)
      (M1.drain) -- (M3.drain) node[circ]{} 
      -| (M3.gate) node[circ]{} -- (M4.gate);
% Numbering the components
\draw (M0.base) node[right] {$M_{0}$};
\draw (M1.base) node[right] {$M_{1}$};
\draw (M2.base) node[left] {$M_{2}$};
\draw (M3.base) node[left] {$M_{3}$};
\draw (M4.base) node[right] {$M_{4}$};
\draw (M1.gate) node[ocirc]{}node[left]{$v_{ip}$};
\draw (M2.gate) node[ocirc]{}node[right]{$v_{im}$};
\draw (M4.drain)node[circ]{} 
      -- ++(0.5,0) node[ocirc]{} node[right]{$v_{out}$};
%Ground and Vdd lines
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% TOP-LEVEL INTERCONNECTIONS %%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\draw (Mt0.source) to node[anchor=south]{$V_{DD}$} (M0.source);
\draw (ref_node) node[circ]{} -- (M3.source)  node[circ]{} -- (M4.source);
\draw (Mt0.gate) node[circ]{} -- (M0.gate);
 
%--------end graphics code ----------
\end{tikzpicture}