function vga_eval(gain_dB)
% gain_dB : combined gain
 
% Constants (gain contraints of HMC625)
gain_min_dB = -13.5; 
gain_max_dB = +18.0;
 
% Gains of individual VGA
vga_gain = zeros(1,2);
 
if gain_dB > 0
  for k=1:length(vga_gain),
    vga_gain(k) = min(gain_max_dB, gain_dB);
    gain_dB = gain_dB - vga_gain(k);
  end
else
  for k=1:length(gain),
    vga_gain(k) = max(gain_min_dB, gain_dB);
    gain_dB = gain_dB - vga_gain(k);
  end
end
  
vga_gain = vga_gain
fprintf(stdout, "Gain = %f\n", vga_gain(1) + vga_gain(2));
if gain_dB > 0
  fprintf("Gain not reached!\n");
end