$$\begin{gathered} \mathrm{restart}\: \\ \mathrm{with}\left(\mathrm{DynamicSystems}\right)\: \\ \mathrm{with}\left(\mathrm{plots}\right)\: \end{gathered}$$

$\mathrm{R\_\_1}≔1000\:$

$\mathrm{C\_\_1}≔{10}^{-7}\:$

$\mathrm{R\_\_In}≔1000\:$

$\mathrm{C\_\_3}≔4.7\cdot {10}^{-8}\:$

$\mathrm{R\_\_2}≔1000\:$

$\mathrm{C\_\_2}≔4.70\cdot {10}^{-7}\:$

$\mathrm{R\_\_f}≔{10}^{102}\:$

$\mathrm{GBP}≔{10}^6\:$

$\mathrm{LPF}≔300\:$

$\mathrm{ll}≔\left(\mathrm{Z1}\,\mathrm{Z2}\right)\to \frac{\mathrm{Z1}\cdot \mathrm{Z2}}{\mathrm{Z1}\+\mathrm{Z2}}\:$

$\mathrm{Z\_\_1}≔\mathrm{R\_\_1}\+\frac{1}{\mathrm{s}\cdot \mathrm{C\_\_1}}\:$

$\mathrm{Z\_\_2}≔\mathrm{R\_\_2}\+\frac{1}{\mathrm{s}\cdot \mathrm{C\_\_2}}\:$

$\mathrm{Z\_\_In}≔\mathrm{ll}\left(\mathrm{R\_\_In}\,\mathrm{Z\_\_1}\right)\:$

$\mathrm{factor}\left(\mathrm{Z\_\_In}\right)$

$\frac{500\left(s+10000\right)}{s+5000}$

$\mathrm{Z\_\_fb}≔\mathrm{ll}\left(\mathrm{R\_\_f}\,\mathrm{ll}\left(\mathrm{Z\_\_2}\,\frac{1}{\mathrm{s}\cdot \mathrm{C\_\_3}}\right)\right)\:$

$\mathrm{G\_\_EAideal}≔\mathrm{factor}\left(\frac{\mathrm{Z\_\_fb}}{\mathrm{Z\_\_In}}\right)$

$\mathrm{G\_\_EAideal}≔\frac{42553.19148\left(s+2127.659574\right)\left(s+5000.\right)}{\left(s+1.934235977\times {10}^{\mathrm{-96}}\right)\left(s+23404.25531\right)\left(s+10000.\right)}$

$\mathrm{\β}≔\frac{1}{1\+\mathrm{G\_\_EAideal}}\:$

$\mathrm{A\_\_vo}≔\frac{\mathrm{GBP}}{\mathrm{LPF}}\cdot \frac{1}{\left(1\+\frac{\mathrm{s}}{2\cdot \mathrm{\π}\cdot \mathrm{LPF}}\right)\cdot \left(1\+\frac{\mathrm{s}}{2\cdot \mathrm{\π}\cdot \mathrm{GBP}}\right)}$

$\mathrm{A\_\_vo}≔\frac{10000}{3\left(1+\frac{s}{600\mathrm{\pi }}\right)\left(1+\frac{s}{2000000\mathrm{\pi }}\right)}$

$\mathrm{simplify}\( \, \'\mathrm{size}\' \)$

$\frac{4000000000000{\mathrm{\pi }}^2}{\left(600\mathrm{\pi }+s\right)\left(2000000\mathrm{\pi }+s\right)}$

$\mathrm{G\_\_EA}≔\mathrm{simplify}\left(\mathrm{G\_\_EAideal}\cdot \frac{1}{1\+\frac{1}{\mathrm{A\_\_vo}\cdot \mathrm{\β}}}\right)$

$\mathrm{G\_\_EA}≔\frac{1.787162409\times {10}^{25}+1.679932664\times {10}^{18}{s}^2+1.197398814\times {10}^{22}s}{5.36148722210544\times {10}^{21}+s^5+6.36102770911571\times {10}^6{s}^4+3.99681963841567\times {10}^{13}{s}^3+1.32302446297123\times {10}^{18}{s}^2+9.24883894862041\times {10}^{21}s}$

$\mathrm{sys1}≔\mathrm{TransferFunction}\left(\mathrm{G\_\_EA}\right)\:$

$\mathrm{sys2}≔\mathrm{TransferFunction}\left(\mathrm{G\_\_EAideal}\right)\:$

$\mathrm{p1}≔\mathrm{PhasePlot}\left(\mathrm{sys1}\,\mathrm{range}\=10 ..100000 \,\mathrm{hertz}\=\mathrm{true}\,\mathrm{legend}\=''Non-ideal''\right)\:$

$\mathrm{p2}≔\mathrm{PhasePlot}\left(\mathrm{sys2}\,\mathrm{range}\=10 ..100000 \,\mathrm{hertz}\=\mathrm{true}\,\mathrm{legend}\=''Ideal'' \,\mathrm{color}\=\mathrm{black}\right)\:$

$\mathrm{display}\left(\mathrm{p1}\,\mathrm{p2}\right)$