%% Progrma to calculte the gain and input resistance of a cascode
%% amplifier. Executing this program requires Symbolic Analysis toolbox.
%% The program makes use of node analysis.
clear all
clc
syms gm1 gm2 ro1 ro2 gmb2 Rd Vin

M=[1/ro2+1/Rd,-gm2-gmb2-1/ro2;-1/ro2,gm2+gmb2+1/ro1+1/ro2];  % Matrix
N=[0;-gm1];                                        % Vector

X=inv(M)*N;

fprintf('Amplifier Gain: \n')
Gain=simplify(X(1));
pretty(Gain)