Hard-Limiter Intermodulation Product Magnitudes for Three Signals in Random Noise

When two or more sinusoidal signals are passed through a hard limiter, intermodulation (IM) products are developed at the limiter output. The magnitudes of the IM products are a function of the relative levels of the input signals, as well as the input noise, if present. This paper considers the case of three input sinusoids plus random noise. Quantitative values for IM-product magnitudes are presented as a function of input signal-signal-to-noise ratio for two specific cases of relative input signal levels.