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 \begin{tikzpicture}
%start graphics code 
%Grid for intial drawing.
%Comment next three lines one typesetting finished
\def\figHt{5.5};
\draw[step=0.5,very thin, black!20] (0.5,0.5) grid (7,6);
\foreach \x in {0,...,7} {\node [anchor=north] at (\x,0.5) {\x};}
\foreach \y in {0,...,6} {\node [anchor=east] at (0.5,\y) {\y};}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% NMOS current mirror %%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\coordinate (ref_node1) at (0,0);
\coordinate (ref_node1T) at ($(ref_node1)+(0,\figHt)$);
%Instantiation of components
\draw (ref_node1) node[nmos,anchor=source,xscale=1] (Mt1){};
\draw (ref_node1T) to [I] (Mt1.drain);
%Interconnections
\draw (Mt1.drain) node[circ]  (Mt1.gate);
% Numbering the components
\draw (Mt1.base) node[left]{$M_{t1}$};
%Ground and Vdd lines
\draw (Mt1.source) node[ground]{};
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% Differential pair %%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\coordinate (ref_node) at (4,0);
\coordinate (ref_nodeT) at ($(ref_node)+(0,\figHt)$);
%Component instantiation
\draw (ref_node) node[nmos,anchor=source] (M0){}
(ref_node) ++(1.5,2) node[nmos, anchor=source] (M1){}
(ref_node) ++(1.5,2) node[nmos, anchor=source, xscale=1] (M2){}
(ref_nodeT) ++(1.5,0) node[pmos, anchor=source, xscale=1] (M3){}
(ref_nodeT) ++(1.5,0) node[pmos, anchor=source] (M4){} ;
%Interconnections
\draw (M1.drain)  (M3.drain)node[circ]  (M3.gate) node[circ]  (M4.gate);
\draw (M4.drain)  (M2.drain);
\draw (M1.source)  (M0.drain) node[circ]  (M2.source);
% Numbering the components
\draw (M0.base) node[right]{$M_0$}
(M1.base) node[right]{$M_1$}
(M2.base) node[left] {$M_2$}
(M3.base) node[left] {$M_3$}
(M4.base) node[right]{$M_4$};
\draw (M1.gate) node[ocirc] node[left] {$v_{ip}$}
(M2.gate) node[ocirc] node[right]{$v_{im}$}
(M2.drain) node[circ]  ++(0.5,0) node[ocirc](vout){} node[right]{$v_{out}$};
%Ground and Vdd lines
\draw (M0.source) node[ground]{};
\draw (M3.source)  ++(1.5,0) node[anchor=south] {$V_{DD}$}  (M4.source);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%% TOP LEVEL INTERCONNECTIONS %%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\draw (M0.gate)  (Mt1.gate) node[circ];
\draw (ref_node1T)  (M3.source) node[circ];
%end graphics code 
\end{tikzpicture} 
\begin{tikzpicture}
%start graphics code 
%Grid for intial drawing.
%Comment next three lines one typesetting finished
\def\figHt{5.5};
\draw[step=0.5,very thin, black!20] (0.5,0.5) grid (7,6);
\foreach \x in {0,...,7} {\node [anchor=north] at (\x,0.5) {\x};}
\foreach \y in {0,...,6} {\node [anchor=east] at (0.5,\y) {\y};}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% NMOS current mirror %%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\coordinate (ref_node1) at (0,0);
\coordinate (ref_node1T) at ($(ref_node1)+(0,\figHt)$);
%Instantiation of components
\draw (ref_node1) node[nmos,anchor=source,xscale=1] (Mt1){};
\draw (ref_node1T) to [I] (Mt1.drain);
%Interconnections
\draw (Mt1.drain) node[circ]  (Mt1.gate);
% Numbering the components
\draw (Mt1.base) node[left]{$M_{t1}$};
%Ground and Vdd lines
\draw (Mt1.source) node[ground]{};
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% Differential pair %%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\coordinate (ref_node) at (4,0);
\coordinate (ref_nodeT) at ($(ref_node)+(0,\figHt)$);
%Component instantiation
\draw (ref_node) node[nmos,anchor=source] (M0){}
(ref_node) ++(1.5,2) node[nmos, anchor=source] (M1){}
(ref_node) ++(1.5,2) node[nmos, anchor=source, xscale=1] (M2){}
(ref_nodeT) ++(1.5,0) node[pmos, anchor=source, xscale=1] (M3){}
(ref_nodeT) ++(1.5,0) node[pmos, anchor=source] (M4){} ;
%Interconnections
\draw (M1.drain)  (M3.drain)node[circ]  (M3.gate) node[circ]  (M4.gate);
\draw (M4.drain)  (M2.drain);
\draw (M1.source)  (M0.drain) node[circ]  (M2.source);
% Numbering the components
\draw (M0.base) node[right]{$M_0$}
(M1.base) node[right]{$M_1$}
(M2.base) node[left] {$M_2$}
(M3.base) node[left] {$M_3$}
(M4.base) node[right]{$M_4$};
\draw (M1.gate) node[ocirc] node[left] {$v_{ip}$}
(M2.gate) node[ocirc] node[right]{$v_{im}$}
(M2.drain) node[circ]  ++(0.5,0) node[ocirc](vout){} node[right]{$v_{out}$};
%Ground and Vdd lines
\draw (M0.source) node[ground]{};
\draw (M3.source)  ++(1.5,0) node[anchor=south] {$V_{DD}$}  (M4.source);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%% TOP LEVEL INTERCONNECTIONS %%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\draw (M0.gate)  (Mt1.gate) node[circ];
\draw (ref_node1T)  (M3.source) node[circ];
%end graphics code 
\end{tikzpicture}
