plot

generate eye diagram from spice sim result

clf;
subplot(2,1,1);
set(semilogx(f, mag), 'LineWidth', 2);
hold
a = axis;
set(semilogx([fpm fpm], [0 a(3)], 'r--'), 'LineWidth', 2);
if ~isempty(igm)
  set(semilogx([fgm fgm], [mag(igm) a(3)], 'r--'), 'LineWidth', 2);
  set(semilogx([f(1) fgm], [mag(igm) mag(igm)], 'r--'), 'LineWidth', 2);
end
grid;
ylabel('Gain (dB)');

subplot(2,1,2);
set(semilogx(f, ph), 'LineWidth', 2);
hold
a = axis;
axis([a(1) a(2) a(3) 0]);
set(semilogx([f(1) fpm], [ph(ipm) ph(ipm)], 'r--'), 'LineWidth', 2);
set(semilogx([fpm fpm], [ph(ipm) 0], 'r--'), 'LineWidth', 2);
if ~isempty(igm)
  set(semilogx([fgm fgm], [ph(igm) 0], 'r--'), 'LineWidth', 2);
end
grid;
ylabel('Phase (dB)');
xlabel('Frequency (Hz)');