plot six curves of input current versus input voltage as function of six fixed values of output voltage for a common emitter bjt in matlab

To plot six curves of input current versus input voltage as a function of six fixed values of output voltage for a common emitter BJT in MATLAB, you can follow the steps below:

main.m
% Common emitter BJT parameters
VBE = 0.7;           % Base-emitter voltage
beta = 100;          % Current gain
VCC = 10;            % Collector supply voltage
RC = 1e3;            % Collector resistor

% Define the input voltage range
Vi = linspace(0, 0.7, 100);

% Define the output voltage values
Vo_values = [1 2 3 4 5 6];   % Change these values as needed

figure;
hold on;

for Vo = Vo_values
    % Calculate the input current
    Ib = (VCC - Vo) / RC;
    Ic = beta * Ib;
    Vi_plot = Vi + VBE;
    Ii = Ic * (exp(Vi_plot / 0.0259) - 1);

    % Plot the input current versus input voltage curve
    plot(Vi, Ii, 'DisplayName', ['Vo = ' num2str(Vo),'V']);
end

hold off;
xlabel('Input Voltage (V)');
ylabel('Input Current (A)');
title('Common Emitter BJT Characteristic Curves');
legend('show');
grid on;
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In this code:

  • The input current is calculated based on the common emitter BJT equations.
  • The input voltage range is defined using linspace.
  • The curves for input current versus input voltage are plotted for each fixed output voltage value.
  • The legend function is used to distinguish between the different curves based on the output voltage.

You can modify the Vo_values array to set the desired fixed output voltage values.

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