INTERMODULATION NOISE IN COMMON AMPLIFICATION SYSTEM.

A formula for the output CN (Carrier-to-Noise: the power ratio) is derived for the intermodulation noise with a nonlinear amplifier. It is found that this ratio depends on the configuration of input channels, the frequency deviation from the center frequency f//c, and the limiting level; it is not always true that the intermodulation noise is the largest at f//c. Numerical analyses are made for two types of input spectra, i. e. , Gaussian and rectangular. Since the intermodulation noise is to be estimated by the CN ratio, the present work presents fundamental data for common amplification.