The gain of the system can be obtained as:
$$ \frac{V_{\mathrm{\ell}}}{V_{s}}=\frac{R_{\mathrm{\ell}}\,\left(R_{b}+A_{i}\,R_{a}+A_{i}\,R_{b}\right)}{R_{a}\,R_{b}+R_{a}\,R_{s}+R_{b}\,R_{s}+R_{b}\,R_{\mathrm{\ell}}+R_{s}\,R_{\mathrm{\ell}}+A_{i}\,R_{b}\,R_{\mathrm{\ell}}} $$
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SLiCAP: Symbolic Linear Circuit Analysis Program, Version 0.6 © 2009-2019 Anton Montagne
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