%% Progrma to calculte the gain of a source-degenerated common-source
%% amplifier. Executing this program requires Symbolic Analysis toolbox.
%% The program makes use of node analysis.
clear all
clc
syms gm ro gmb Rs Rd

M=[1/ro,-gm-gmb-1/ro-1/Rs;1/ro+1/Rd,-gm-gmb-1/ro];  % Matrix
N=[-gm;-gm];                                        % Vector

X=inv(M)*N;

X1=simplify(X(1));
pretty(X1)