\bigskip \begin{center} \begin{texdraw} \drawdim in \linewd 0.015 \setunitscale 0.75 \arrowheadtype t:F \arrowheadsize l:0.12 w:0.06 %begin textrectangle %begin rectangle \move(0.82 -0.02) \lvec(0.82 -0.53) \move(0.82 -0.02) \lvec(1.33 -0.02) \move(1.33 -0.53) \lvec(1.33 -0.02) \move(1.33 -0.53) \lvec(0.82 -0.53) %end rectangle \textref h:C v:C \htext (1.08 -0.28){$G_{\mathrm{n}}$} %end textrectangle %begin textellipse %begin ellipse \move(1.75 -0.27) \clvec(1.75 -0.20)(1.82 -0.13)(1.90 -0.13) \move(1.90 -0.13) \clvec(1.98 -0.13)(2.05 -0.20)(2.05 -0.27) \move(2.05 -0.27) \clvec(2.05 -0.34)(1.98 -0.41)(1.90 -0.41) \move(1.90 -0.41) \clvec(1.82 -0.41)(1.75 -0.34)(1.75 -0.27) %end ellipse \textref h:C v:C \htext (1.90 -0.27){$+$} %end textellipse %begin textrectangle %begin rectangle \move(2.32 -0.02) \lvec(2.32 -0.53) \move(2.32 -0.02) \lvec(2.83 -0.02) \move(2.83 -0.53) \lvec(2.83 -0.02) \move(2.83 -0.53) \lvec(2.32 -0.53) %end rectangle \textref h:C v:C \htext (2.58 -0.28){$\Delta$} %end textrectangle %begin textellipse \textref h:C v:C \htext (3.34 -0.28){$\scriptstyle \bullet$} %end textellipse %begin textrectangle %begin rectangle \move(2.32 -0.78) \lvec(2.32 -1.29) \move(2.32 -0.78) \lvec(2.83 -0.78) \move(2.83 -1.29) \lvec(2.83 -0.78) \move(2.83 -1.29) \lvec(2.32 -1.29) %end rectangle \textref h:C v:C \htext (2.58 -1.03){$\Phi_{\mathrm{n}}$} %end textrectangle %begin line \move(3.34 -0.27) \lvec(3.34 -1.04) %end line %begin arrow \move(3.34 -1.04) \avec(2.85 -1.04) %end arrow %begin arrow \move(1.90 -1.03) \avec(1.90 -0.41) %end arrow %begin line \move(2.32 -1.04) \lvec(1.90 -1.04) %end line %begin textrectangle %begin rectangle \move(3.91 -0.02) \lvec(3.91 -0.53) \move(3.91 -0.02) \lvec(4.42 -0.02) \move(4.42 -0.53) \lvec(4.42 -0.02) \move(4.42 -0.53) \lvec(3.91 -0.53) %end rectangle \textref h:C v:C \htext (4.17 -0.28){$H_{\mathrm{n}}$} %end textrectangle %begin textellipse %begin ellipse \move(4.76 -0.27) \clvec(4.76 -0.20)(4.83 -0.13)(4.91 -0.13) \move(4.91 -0.13) \clvec(4.99 -0.13)(5.06 -0.20)(5.06 -0.27) \move(5.06 -0.27) \clvec(5.06 -0.34)(4.99 -0.41)(4.91 -0.41) \move(4.91 -0.41) \clvec(4.83 -0.41)(4.76 -0.34)(4.76 -0.27) %end ellipse \textref h:C v:C \htext (4.91 -0.27){$+$} %end textellipse %begin arrow \move(0.48 -0.27) \avec(0.82 -0.27) %end arrow %begin arrow \move(1.34 -0.27) \avec(1.73 -0.27) %end arrow %begin arrow \move(2.05 -0.27) \avec(2.34 -0.27) %end arrow %begin arrow \move(2.83 -0.27) \avec(3.90 -0.27) %end arrow %begin arrow \move(4.42 -0.27) \avec(4.76 -0.27) %end arrow %begin arrow \move(5.46 -0.27) \avec(5.05 -0.27) %end arrow %begin textrectangle %begin rectangle \move(0.82 -1.55) \lvec(0.82 -2.06) \move(0.82 -1.55) \lvec(1.33 -1.55) \move(1.33 -2.06) \lvec(1.33 -1.55) \move(1.33 -2.06) \lvec(0.82 -2.06) %end rectangle \textref h:C v:C \htext (1.08 -1.80){$G_{\mathrm{s}}$} %end textrectangle %begin textellipse %begin ellipse \move(1.75 -1.80) \clvec(1.75 -1.73)(1.82 -1.66)(1.90 -1.66) \move(1.90 -1.66) \clvec(1.98 -1.66)(2.05 -1.73)(2.05 -1.80) \move(2.05 -1.80) \clvec(2.05 -1.87)(1.98 -1.94)(1.90 -1.94) \move(1.90 -1.94) \clvec(1.82 -1.94)(1.75 -1.87)(1.75 -1.80) %end ellipse \textref h:C v:C \htext (1.90 -1.80){$+$} %end textellipse %begin textrectangle %begin rectangle \move(2.32 -1.55) \lvec(2.32 -2.06) \move(2.32 -1.55) \lvec(2.83 -1.55) \move(2.83 -2.06) \lvec(2.83 -1.55) \move(2.83 -2.06) \lvec(2.32 -2.06) %end rectangle \textref h:C v:C \htext (2.58 -1.80){$\Delta$} %end textrectangle %begin textellipse \textref h:C v:C \htext (3.34 -1.81){$\scriptstyle \bullet$} %end textellipse %begin textrectangle %begin rectangle \move(2.32 -2.31) \lvec(2.32 -2.82) \move(2.32 -2.31) \lvec(2.83 -2.31) \move(2.83 -2.82) \lvec(2.83 -2.31) \move(2.83 -2.82) \lvec(2.32 -2.82) %end rectangle \textref h:C v:C \htext (2.58 -2.56){$\Phi_{\mathrm{s}}$} %end textrectangle %begin line \move(3.34 -1.80) \lvec(3.34 -2.57) %end line %begin arrow \move(3.34 -2.57) \avec(2.85 -2.57) %end arrow %begin arrow \move(1.90 -2.56) \avec(1.90 -1.94) %end arrow %begin line \move(2.32 -2.57) \lvec(1.90 -2.57) %end line %begin textrectangle %begin rectangle \move(3.91 -1.55) \lvec(3.91 -2.06) \move(3.91 -1.55) \lvec(4.42 -1.55) \move(4.42 -2.06) \lvec(4.42 -1.55) \move(4.42 -2.06) \lvec(3.91 -2.06) %end rectangle \textref h:C v:C \htext (4.17 -1.80){$H_{\mathrm{s}}$} %end textrectangle %begin textellipse %begin ellipse \move(4.76 -1.80) \clvec(4.76 -1.73)(4.83 -1.66)(4.91 -1.66) \move(4.91 -1.66) \clvec(4.99 -1.66)(5.06 -1.73)(5.06 -1.80) \move(5.06 -1.80) \clvec(5.06 -1.87)(4.99 -1.94)(4.91 -1.94) \move(4.91 -1.94) \clvec(4.83 -1.94)(4.76 -1.87)(4.76 -1.80) %end ellipse \textref h:C v:C \htext (4.91 -1.80){$+$} %end textellipse %begin arrow \move(0.48 -1.80) \avec(0.82 -1.80) %end arrow %begin arrow \move(1.34 -1.80) \avec(1.73 -1.80) %end arrow %begin arrow \move(2.05 -1.80) \avec(2.34 -1.80) %end arrow %begin arrow \move(2.83 -1.80) \avec(3.90 -1.80) %end arrow %begin arrow \move(4.42 -1.80) \avec(4.76 -1.80) %end arrow %begin arrow \move(4.91 -0.41) \avec(4.91 -1.65) %end arrow %begin textellipse \textref h:C v:C \htext (5.37 -1.81){$\bullet$} %end textellipse %begin textellipse \textref h:C v:C \htext (5.82 -1.81){$\bullet$} %end textellipse %begin line \move(4.91 -1.04) \lvec(5.82 -1.04) %end line %begin line \move(5.82 -1.04) \lvec(5.82 -1.79) %end line %begin textellipse \textref h:C v:C \htext (4.91 -1.05){$\scriptstyle \bullet$} %end textellipse %begin line \move(5.07 -1.80) \lvec(5.38 -1.80) %end line %begin line \move(5.82 -1.79) \lvec(5.59 -2.24) %end line %begin textellipse \textref h:C v:C \htext (5.58 -2.25){$\bullet$} %end textellipse %begin arrow \move(5.58 -2.26) \avec(5.58 -2.84) %end arrow \move(5.45 -2.05) \clvec(5.66 -1.85)(5.97 -2.08)(5.79 -2.31) %end bz %begin arrow \move(5.57 -1.98) \avec(5.46 -2.04) %end arrow %begin arrow \move(5.84 -2.20) \avec(5.78 -2.33) %end arrow %begin textrectangle \textref h:C v:C \htext (0.35 -0.15){$w_{\mathrm{n}}(t_i)$} %end textrectangle %begin textrectangle \textref h:C v:C \htext (0.35 -1.67){$w_{\mathrm{s}}(t_i)$} %end textrectangle %begin textrectangle \textref h:C v:C \htext (3.64 -0.75){$x_{\mathrm{n}}(t_i)$} %end textrectangle %begin textrectangle \textref h:C v:C \htext (3.64 -2.30){$x_{\mathrm{s}}(t_i)$} %end textrectangle %begin textrectangle \textref h:C v:C \htext (5.49 -0.15){$v(t_i)$} %end textrectangle %begin textrectangle \textref h:C v:C \htext (5.25 -2.73){$z(t_i)$} %end textrectangle %begin textrectangle \textref h:C v:C \htext (5.30 -2.14){$t_k^{\mathrm{on}}$} %end textrectangle %begin textrectangle \textref h:C v:C \htext (5.82 -2.47){$t_k^{\mathrm{off}}$} %end textrectangle \end{texdraw} \end{center}