The signal-handling capacity of the square-wave switched ring modulator

Expressions are derived for the maximum permissible interfering input signal power which may be applied to a square-wave switched resistively terminated ring modulator before the onset of severe cross-modulation distortion in the output spectrum. The effects of source and load mismatch are considered and good agreement demonstrated between theoretical prediction and the measured performance of a typical ring modulator using Schottky barrier diodes.