Minimum conversion loss and input match conditions in the broadband mixer

The two approaches to the optimization of broadband mixer loss are compared and contrasted. Using a recently-developed model of the diode and local-oscillator circuit calculations are made to show the difference in the loss in each case, and the mismatch required at the input to achieve minimum loss. It is concluded that the design procedure in which the mixer is matched at the input is practical, and that designing for minimum loss invoking mismatch is not to be recommended.